Category: Class 4

Tamilnadu State Board New Syllabus Samacheer Kalvi 4th Science Guide Pdf Term 2 Water 1 Food Text Book Back Questions and Answers, Notes.

Tamilnadu Samacheer Kalvi 4th Science Solutions Term 2 Chapter 2 Water

Samacheer Kalvi 4th Science Guide Water Text Book Back Questions and Answers

I. Choose the correct answer :

Question 1.
Water is the most _____________ resource on the Earth.
(a) Precious
(b) Solid
(c) Gas
Answer:
(a) Precious

Question 2.
Water exists in _____________ states.
(a) Two
(b) Three
(c) Four
Answer:
(b) Three

Question 3.
At temperature below ____________ water freezes to form ice.
(a) 10°C
(b) 100°C
(c) 0° C
Answer:
(c) 0°C

Question 4.
___________ is the process by which water becomes water vapour.
(a) Condensation
(b) Evaporation
(c) Freezing
Answer:
(b) Evaporation

Question 5.
Which controls the ecological functions of life?
(a) Bicycle
(b) Water cycle
(c) Recycle water
Answer:
(b) Water cycle

II. Fill in the blanks with suitable answer :

Question 1.
Water is converted into ____________ when it is heated. (ice cube/water vapour).
Answer:
water vapour

Question 2.
Water becomes ice on ____________. (heating/freezing).
Answer:
Freezing

Question 3.
Water droplets combine to form _____________. (rain/clouds).
Answer:
Clouds

Question 4.
Water cycle increases the availability of ______________. (water tank/ground water).
Answer:
Ground water

Question 5.
___________ is a type of rainwater harvesting. (Roof top harvesting/Watercycle).
Answer:
Roof top harvesting

III. Write True or False :

Question 1.
Water is a good example for all states of matter.
Answer:
True

Question 2.
Water cycle controls Earth’s temperature.
Answer:
True

Question 3.
Water becoming water vapour on heating is called evaporation.
Answer:
True

Question 4.
37% of our brain’s mass consists of water.
Answer:
False

Question 5.
Roof top harvesting method is used in agriculture field.
Answer:
False

IV. Answer briefly :

Question 1.
Write the states of water.
Answer:
Water occurs naturally in three forms: ice, water and water vapour. These forms are also called states of water. Ice is in solid form, water is in liquid form and water vapour is in gaseous form.

Question 2.
What is freezing?
Answer:
Ice is a solid form of water. At temperature below 0° C water becomes ice. This process is called freezing.

Question 3.
Name the processes involved in water cycle.
Answer:
Evaporation, Condensation, Precipitation.

Question 4.
Which state government made rain water harvesting as mandatory in the year 2001?
Answer:
Tamil Nadu is the first Indian state which made rainwater harvesting as mandatory in 2001.

Question 5.
What is needed to construct a rain water harvesting pit?
Answer:
Boulders, gravels and Coarse sand are needed to construct a rain water harvesting pit.

V. Answer in detail :

Question 1.
What is water cycle? Write any three importances of water cycle.
Answer:
The continuous cycle through which water is circulated by different processes like evaporation, condensation and precipitation is called water cycle.
Importances of water cycle :

• To improve the availability of ground water.
• To control the Earth’s temperature.
• To provide water to plants and animals especially humans.
• To recycle the Earth’s supply of water constantly.

Question 2.
What is rain water harvesting? List out the advantages of rain water harvesting.
Answer:
‘Rainwater harvesting’ is the process of collecting and storing rainwater for future use. Rainwater can be collected in natural reservoirs or artificial tanks. Roof top harvesting is also a type of rainwater harvesting. The rainwater on the top of the building is collected and passed into the ground through pipes.

Water passing thrcugh the pipes enters the pit which consist of gravels and Coarse sand. As it passes impurities are filtered and stored as ground water.
Advantages of rain water harvesting:

• It increases the ground water level
• It can be used for agriculture
• It increases the availability of water for living things.

V. Colour the given picture and write the correct name in the given blanks :

Question 1.

Answer:
Activity to be done by the students themselves

Samacheer Kalvi 4th Science Guide Water InText Questions and Answers

Let us do (Text Book page No. 69)

Question 1.
See the given pictures and write down the state of each objects.(Solid, Liquid, Gas)

Answer:

Let us do (Text Book page No. 70)

Question 1.
Fill in the boxes given below with correct answers.
(Liquid, Solid, Melting, Freezing, Cooling, Heating, Gas)

Answer:
Change of states in water

Question 2.
Write any two water bodies in your area
Answer:
River, lake

Try to Answer (Text Book page No. 71)

Question 1.
Why water is a good example for all states of matter?
Answer:
Water is unique because it is the only natural substance that can exist in all three states of matter at the temperatures normally found on Earth! Water is usually a liquid, but when it reaches to 0° C (32° Fahrenheit (F)), it freezes into ice. (Ice is the solid state of water.) When water reaches 100° C (212° F), it boils.

When it begins to boil, some of the water turns into steam. (Steam is the gas state of water, and is also called water vapour.) When steam comes into contact with cool air (which reduces energy), it can condense back into water droplets (liquid again). Those water droplets could then freeze into (solid) ice.

Question 2.
Which of the following is in liquid state? Rain/Ice/Snow
Answer:
Rain.

Let us do (Text Book page No. 71)

Question 1.
Fill water in an ice tray and keep it in the freezer. After few hours, take it out. What happened to the water?
Answer:
Water turns into Ice (Solid state).

Question 2.
Now keep this ice tray on a table for some time. What happens to the ice?
Answer:
Ice melts and turns into liquid.

Question 3.
Pour water from the ice tray into a kettle. Ask an elder at your home to heat the kettle and observe the mouth of the kettle when the water starts boiling. What do you see?
Answer:
I see the water turns into vapour and bubbles are formed.

Think and Answer (Text Book page No. 72)

Question 1.
What happens to the water in a wet cloth?
Answer:
The water, in a wet cloth, gets evaporated. The cloth will be dried up.

Try to Answer (Text Book page No. 72)

Choose the correct answer.

Question 1.
In the water cycle ____________.
(a) Only evaporation is involved
(b) Only condensation is involved
(c) Evaporation and condensation are involved
Answer:
(c) Evaporation and condensation are involved

Try to Answer (Text Book page No. 72)

Question 1.
Unscramble the words and fill in the blanks.
(a) ondencsaonti
Answer:
Condensation

(b) vaeionorpat
Answer:
evaporation

c) ecippitatrino
Answer:
(c) precipitation

Question 2.
Is water cycle important for farming? ____________
Answer:
Yes

Question 3.
Why is water cycle important to human? ________________
Answer:
The water cycle is constantly recycling the Earth’s supply of water. As humans need water to service, Water cycle is important.

Question 4.
Name the process which is responsible for the formation of droplets on the surface of a glass of cold drink. _______
Answer:
Condensation

Try to Answer (Text Book page No. 74)

Question 1.
List out some other benefits of rain water harvesting.
Answer:

• It reduces flooding and erosion.
• It can be used for non-drinking purposes, liking bathing, washing clothes, etc.
• It can improve plant Growth.

Question 2.
Suggest some ideas to save rainwater in your school.
Answer:

• Create awareness about the benefits of Rainwater Harvesting.
• Collect excess water by placing huge plastic drums.
• Install aerators on taps. Aerators reduce the amount of water flowing from the tap by upto 50%.
• Install rainwater tanks. Then connect the tanks to toilets or to the garden.

Let us do (Text Book page No. 74)

Question 1.
Discuss with your friends.
Rain water harvesting has an important role to protect our environment.
Answer:
Importance of Rainwater Harvesting :
Rainwater harvesting can be a permanent solution to the problem of the water crisis. This is particularly applicable in hilly areas where rainwater harvesting can be utilized for human consumption, for animals and also for farming.
A bad monsoon means low crop yield and shortage of food.

Even animals suffer from a scarcity of water. We face acute water crisis during the summer months. The farmers are the most affected because they do not get sufficient water for their fields. Rainwater harvesting, therefore, is an ideal solution for farmers who depend on monsoon for consistent water supply.

Unavailability of clean water compels the consumption of polluted water, giving rise to water-borne diseases and a high rate of infant mortality.

If rainwater, which comes for free, can be collected and stored, instead of letting it run off, it could be an alternative to back up the main water supply especially during dry spells.

Its importance will not be limited to an individual family but can be used by a community as well. It also creates a sense of social responsibility and awareness about the environment.

The importance of rainwater harvesting lies in the fact that it can be stored for future use. Harvesting rainwater checks surface runoff of water and reduce soil erosion.

In areas having sparse and irregular rainfall, scarcity of water is a persistent problem. It cannot be completely resolved but can be mitigated through rainwater harvesting.

Samacheer Kalvi 4th Science Guide Water Additional Questions and Answers

I. Choose the best answer :

Question 1.
Ice is in form of ____________.
(a) Gas
(b) Liquid
(c) Solid
(d) Vapour
Answer:
(c) Solid

Question 2.
____________ of our brain’s mass consists of water
(a) 43%
(b) 53%
(c) 63%
(d) 73%
Answer:
(d) 73%

Question 3.
The Antartic region has about ___________ of the worlds fresh water.
(a) 70%
(b) 60%
(c) 50%
(d) 40%
Answer:
(a) 70%

Question 4.
__________ is the chemical formula of water.
(a) H₂O
(b) HO
(c) H₃O₂
(d) O₂.
Answer:
(a) H₂O

II. Fill in the blanks with suitable answer :

Question 1.
Human body consists of _____________ of water. Water( 65% / 75%)
Answer:
75%

Question 2.
_____________ is the only way to conserve rain water. (Condensation/Rainwater harvesting)
Answer:
Rain water harvesting

Question 3.
Each day, we lose a little more than a cup of water when we exhale.(inhale/ exhale)
Answer:
Exhale

III. Write True or False :

Question 1.
The rainwater harvesting was launched by the Tamil Nadu government in 2011.
Answer:
False

Question 2.
1 inch of rainfall on a 2000 sq.ft. roof is equal to 4,800 litres of water.
Answer:
True

IV. Answer the following questions in one or two sentences :

Question 1.
Where is water available in the liquid state?
Answer:
Water in liquid state is available in water bodies such as oceans, river, waterfalls etc.

Question 2.
How will you get water vapour from water?
Answer:
Water becomes water vapour as the temperature increases due to heat. Heating forms a white mist of extremely small water droplets in the air known as water vapour.

V. Answer in detail :

Question 1.
How will you construct a rainwater harvesting pit?
Answer:
Tips to construct a rainwater harvesting pit at school/home. Construct a pit of any shape or size. It may be generally constructed, 1-2 metre wide and 2-3 metre depth. The pits can be filled with boulders, gravels and Coarse sand. Put the boulders in the bottom, sand in the top and gravels in the middle.

Tamilnadu State Board New Syllabus Samacheer Kalvi 4th Science Guide Pdf Term 2 Chapter 1 Food Text Book Back Questions and Answers, Notes.

Tamilnadu Samacheer Kalvi 4th Science Solutions Term 2 Chapter 1 Food

Samacheer Kalvi 4th Science Guide Food Text Book Back Questions and Answers

I. Choose the heat answer :

Question 1.
Which one can be eaten as raw food?
(a) Meat
(b) Carrot
(c) Fish
(d) Potato
Answer:
(b) Carrot

Question 2.
Uncooked food is called
(a) Junk food
(b) Hygienic food
(c) Raw food
(d) Cooked food
Answer:
(c) Row food

Question 3.
Solar cooker reduces _____________.
(a) Air pollution
(b) Water pollution
(c) Air pollution
(d) Noise pollution
Answer:
(c) Air pollution

Question 4.
Which one cannot be preserved by drying method?
a) Rice
b) Cereals
c) Fish
d) Fruits
Answer:
(a) Rice

Question 5.
We can avoid food wastage by
(a) Giving to the needy
(b) Eating more than we need
(c) Buying extra food
(d) Throwing in a dust bin
Answer:
(a) Giving to the needy

II. Fill in the blanks :

Question 1.
__________ gives us energy to work and play. (Raw food / Junk food)
Answer:
Raw food

Question 2.
Cooked food is easily ___________. (digested / undigested)
Answer:
Digested

Question 3.
Pressure cooker is one of the ____________ utensils, (modern / olden)
Answer:
Modern

Question 4.
We need pure air, protected water and ____________ food for our healthy life. (junk / hygienic)
Answer:
Hygienic

III. Match the following :

Question 1.

Answer:

IV. Write Yes or No :

Question 1.
Biriyani is a raw food.
Answer:
No

Question 2.
Frying is a method of cooking.
Answer:
Yes

Question 3.
We can cook rice on a tawa.
Answer:
No

Question 4.
Cooking in a solar oven needs sunlight.
Answer:
Yes

Question 5.
Consuming too much oily food is bad for our health.
Answer:
Yes

V. Answer briefly :

Question 1.
Name any three cooking methods.
Answer:

1. Boiling
2. Steaming
3. Baking

Question 2.
Write any two food items you should eat when you are sick?
Answer:

• Porridge of rice or cereals.
• Fruit juice, tender coconut.
• Steamed foods like idly.

Question 3.
Draw one of your favourite raw food and colour it.
Answer:
Raw foods : Mango,Apple, Banana, Carrot, Onion, etc.
Student has to draw any one item and colour it.

Question 4.
Write about any two preservation methods.
Answer:

• Pickling – Mixing fruits and vegetables with oil and salt. Example- Pickle
• Refrigerating – Keeping food in the refrigerators (fridge) to preserve them for a short time. Example-Fruits,Vegetables

Question 5.
How can you reduce wastage of food in your home?
Answer:
We should not waste food. Food that is not eaten is called leftover food. That is discarded as waste. Following are the simple ways to avoid food wastage.

1. Take what you’ll eat and eat what you take.
2. Share the excess food.
3. Give the excess food to hungry animals.

V. Answer in detail :

Question 1.
Explain some food preservation methods.
Answer:
We can preserve the food for long time by using the following methods.

• Pickling – Mixing fruits and vegetables with oil and salt.
  Example: Pickle
• Refrigerating – Keeping food in the refrigerators (fridge) to preserve them for a short time.
  Example: Fruits,Vegetables
• Drying – Removing the water content of the food.
  Example: Fish, Red chillies
• Canning – Storing food in air tight containers.
  Example: Jam

Question 2.
Explain any four cooking methods.
Answer:
Some of the commonly used cooking methods are given below.

1. Boiling: It is a method of cooking food by immersing it in boiling water. So that the food becomes soft.
   Example: Rice, Egg.
2. Steaming: It is a method of cooking food in steam by immersing the vessel in a container with boiling water.
   Example: Idli, Idiyappam.
3. Pressure cooking: It is a method of cooking food in a pressure cooker. Example: Rice, Dhal.
4. Roasting: It is a method of cooking food by heating on a tawa or frying pan without covering it.
   Example: Groundnuts, Cashew nut.
5. Frying: It is a method of cooking food in hot oil.
   Example: Chips, Poori.

Question 3.
What are the hygenic ways of cooking food?
Answer:

• Wash your hands with soap before cooking.
• Wash vegetables and fruits before cutting.
• Wash cooking vessels and knives.
• Don’t cook food for a long time because it destroys the nutrients present in the food.
• Don’t use the same oil for cooking food many times.
• Using the food items after their expiry date is not good for health.

Let us do (Text Book Page No. 57)

Question 1.
Classify the following food items.

(Carrot, Egg, Coconut oil, Milk, Radish, Meat, Potato, Curd, Brinjal, Lady’sfinger, Fish, Drumstick, Butter, Onion, Buttermilk, Cucumber, Ghee)

Food items from Plants	Food items from animals
Carrot	Egg
Coconut oil	Milk
Radish	Meat
Potato	Curd
Brinjal	Fish
Lady’s finger	Butter
Drumstick	Buttermilk
Onion	Ghee
Cucumber	–

Samacheer Kalvi 4th Science Guide Food In Text Questions and Answers

Think and Answer (Text Book Page No. 58)

Question 1.
Which food do you eat without cooking?
Answer:
We eat fruits, some vegetables, tubers and nuts in the raw form. Some pulses ind cereals are also eaten as without cooking.

Try to Answer (Text Book Page No. 59)

Question 1.
Write any five raw and cooked food.
Answer:
(a) Raw food: Carrot ,Gooseberry ,Cucumber, Mango and Banana
(b) Cooked food: Rice , puttu , Idiyappam , Idli , and Dosal.

Think and Answer (Text Book Page No. 59)

Question 1.
Children, look at the menu card given here. Do you see food items on this menu? Do you think all these items are cooked the same way?

Answer:
No, All are not cooked in the same way.

Let us do (Text Book Page No. 61)

Question 1.
Tabulate the given food items according to the cooking methods.

Answer:
(Rice, Poori, Murukku, Pop-corn, Idli, Milk, Fish, Puttu, Dhal, Idiyappam, Groundnut)

Try to Answer (Text Book Page No. 61)

Question 1.
Write any two cooking methods that your mother follows:
Answer:
Boiling, Steaming.

Question 2.
Say True or False.
(a) You should wash your hands before cooking.
Answer:
True
(b) Vegetables and fruits should be washed after cutting.
Answer:
False

Let us do (Text Book Page No. 62)

Question 1.
Write the cooking utensils used for preparing given food items.

Answer:
(Pan, Pot, Rice cooker, Tawa, Idli cooker)

Food Items	Name the cooking utensils
Rice	Rice cooker
Idiyappam, Puttu	Idli cooker
Vada	Tawa
Sambar	Pot
Dosa	Pan

Try to Answer (Text Book Page No. 62)

Write True or False.

Question 1.
Earlier people cooked their food in pressure cooker.
Answer:
False

Question 2.
Solar cooker reduces the use of fuel.
Answer:
True

Question 3.
Pressure cooker is not a cooking utensil.
Answer:
False

Think and Answer (Text Book Page No. 63)

Question 1.
Look at the pictures given below. Which one is good for health? Why?

Answer:
Food items, in the right side picture, are good for health. The food items are neatly kept in a closed containers. The place is also free from mosquitoes, flies, etc.

Let us do (Text Book Page No. 64)

Tick (✓) the appropriate one.

Question 1.

Food	Hygienic food	Junk food
Fresh fruits
Burger
Nuts
Panipoori
Vegetable salad

Answer:

Food	Hygienic food	Junk food
Fresh fruits	✓
Burger		✓
Nuts	✓
Panipoori		✓
Vegetable salad	✓

Try to Answer (Text Book Page No. 64)

Question 1.
Junk food is good for health. _____________
Answer:
No

Question 2.
You should wash your hands before and after eating. ______________
Answer:
Yes

Let us discuss (Text Book Page No. 64)

Question 1.
Here is Nandini’s lunch box.

Answer:
(a) Are all the items healthy?
No. Chips are not healthy.
(b) Suggest her to remove one food which is not healthy and add one food which is healthy. Give reasons for change.
Answer:
Remove the chips item. Add ground nuts.

Think and answer (Text Book Page No. 63)

Question 1.
When you are sick, what kind of food your mother serves you?
Answer:
Idly, Porridge of rice, and fruit juices.

Try to Answer (Text Book Page No. 65)

Fill in the blanks.

Question 1.
___________ is an easily digested food. (Idly / Biriyani)
Answer:
Idly

Question 2.
We should avoid eating ___________ food, (junk/ fresh)
Answer:
Junk

Think and Answer (Text Book Page No. 65)

Question 1.
Do you usually eat your lunch without wasting anything? If you say no, why do you waste?
Answer:
Yes, I usually eat my lunch without wasting anything.

Question 2.
Can you suggest few ways to reduce food waste in your schools and houses?
Answer:

1. We should not take excess quantity of food in our plate.
2. We should serve others smaller portions of food on smaller dishes.
3. While purchasing the food products, we have to take care about the quantity

Try to answer (Text Book Page No. 65)

Fill the blanks :

Question 1.
World Hunger Day is observed on ____________
Answer:
May 28

Question 2.
We can preserve pickle by ___________
Answer:
pickling

Samacheer Kalvi 4th Social Science Guide Food Additional Questions and Answers

I. Choose the correct answer :

Question 1.
Healthy food
(a) Fruit
(b) chips
(c) chocolate
(d) ice cream
Answer:
(a) Fruit

Question 2.
Unhealthy food
(a) Nuts
(b) Milk
(c) Burger
(d) vegetables
Answer:
(c) Burger

Question 3.
Which one can be preserved by drying method?
(a) Pickles
(b) Vegetables
(c) Red chillies
(d) Jam
Answer:
(c) Red chillies

II. Fill in the blanks :

Question 1.
Cooking in ________ improves the quality and taste of food. (Aluminium Utensil/ clay pot)
Answer:
clay pot

Question 2.
____________ is one of the basic needs of life. (Clothes/ Food)
Answer:
Food

III. Match the following :

Question 1.

Answer:

VI. Answer tn brief :

Question 1.
Write a note on cooking utensils.
Answer:
Utensils are in different shapes and sizes. We use specific utensils for each cooking method. Clay pots were used earlier. Stainless steel and aluminum vessels are now generally used for cooking.

Question 2.
What is a Solar cooker?
Answer:
It is an appliance which is used to cook food using sunlight. It saves fuel and reduces air pollution.

Question 3.
What is Raw food?
Answer:
Food that we eat directly without cooking is called raw food. We eat fruits, some vegetables, tubers and nuts in the raw form. Some pulses and cereals are also eaten as raw food.

Question 4.
How to make Salad?
Answer:
Collect some raw food items available in our locality. Clean them with fresh water, cut them into small pieces (keep the nuts whole), put them in a bowl then add salt, spices and mix it well. Now, our tasty salad is ready.

Question 5.
Why should we cook food?
Answer:

• Cooked food is digested easily.
• Cooking softens the food materials.
• Cooking kills germs.
• Cooking adds taste and flavour to food.

VI. Answer in detail :

Question 1.
List out the benefits of clay pot cooking.
Answer:

• Easy to digest.
• Preserves the nutrients. m Needs less oil for cooking.
• Adds flavour to the dish.
• Keeps the food warm for a long time.
• Keeps the food from becoming stale soon.
• Alkaline property in the pot neutralizes the acidic property in the food.

Question 2.
What are the hygienic ways of taking food ?
Answer:

• Always cover food to protect them from dust and insects.
• Eat fresh food always.
• Avoid taking food that is too cold or too hot.
• Avoid fast food and fried food.
• Always wash your hands with soap before and after eating.

Tamilnadu State Board New Syllabus Samacheer Kalvi 4th Science Guide Pdf Term 3 Chapter 3 Air We Breath Text Book Back Questions and Answers, Notes.

Tamilnadu Samacheer Kalvi 4th Science Solutions Term 3 Chapter 3 Air We Breath

Samacheer Kalvi 4th Science Guide Air We Breath Text Book Back Questions and Answers

I. Choose the correct answer :

Question 1.
Air is a __________
(a) Mixture
(b) Compound
(c) Complex
Answer:
(a) Mixture

Question 2.
Percentage of oxygen in air is about
(a) 21
(b) 78
(c) 1
Answer:
(a) 21

Question 3.
Root nodules of some plants contain .
(a) Oxygen
(b) Nitrogen
(c)Neon
Answer:
(b) Nitrogen

Question 4.
The major reason for air pollution is
(a) Waste
(b) Smoke
(c)Water vapour
Answer:
(b) Smoke

II. WHO AM I?

Question 1.
I am a mixture of gases.
Answer:
Air

Question 2.
I give you oxygen.
Answer:
plants

Question 3.
I am not the supporter of burning.
Answer:
Nitrogen

Question 4.
You can help me to decrease pollution by riding on me.
Answer:
Bicycle

III. Write ‘True’ or ‘False’ :

Question 1.
plants need nitrogen for their growth.
Answer:
True

Question 2.
Air is made up of oxygen only.
Answer:
False

Question 3.
The gas used for burning things is argon.
Answer:
False

Question 4.
Carbonated drinks are bad to health.
Answer:
True

IV. Match the following :

Question 1.

Answer:

V. Fill in the blanks :

Question 1.
Air is a mixture of many _________
Answer:
Gases

Question 2.
Amount of carbon dioxide in the air is ___________%
Answer:
0.03

Question 3.
We inhale __________ gas.
Answer:
Oxygen

Question 4.
__________ is used in fire extinguishers.
Answer:
Carbon dioxide

VI. Answer the following questions in brief :

Question 1.
What are the importance of air in our daily life?
Answer:

• Oxygen present in air is needed for respiration.
• We can speak and hear the sound only when there is air around.
• Air helps in the dispersal of seeds for plant reproduction.
• Monsoon and rain occurs due to the wind action.
• Air regulates the atmospheric temperature.

Question 2.
What are the components of air?
Answer:
Components of air are

• Nitrogen
• Argon
• Carbon dioxide
• Other gases

Question 3.
What are the adverse effects of air pollution?
Answer:

• Global warming
• Formation of smog,
• Formation of acid rain
• Aerosol formation
• Depletion of ozone

Question 4.
List uses of oxygen.
Answer:

• All living things use oxygen for breathing.
• Oxygen is essential for burning.
• Oxygen cylinders are used in hospitals to enable the patients to breathe when they cannot breathe normally.
• Oxygen is used in gas welding.

VII. Give short answers :

Question 1.
How can we reduce air pollution?
Answer:
Air pollution can be reduced by the following steps.

1. Alternative source of energy (E.g. Solar energy) should be used.
2. Air filters should be used to prevent harmful gases mixing with air.
3.  Smoke emission test and certification of motor vehicles must be enforced.
4. More trees should be planted to absorb carbon dioxide.

Question 2.
What are the diseases caused due to air pollution?
Answer:
Air pollution cause irritation in the eyes, nose and throat. Air pollution can
also produce wheezing, coughing and breathing problems in humans.
Some of the major effects of air pollution on human beings are:

• Respiratory diseases.
  Example: Flu, Tuberculosis
• Cardiovascular damage.
• Fatigue, headaches and anxiety.
• Nervous system damage.

Question 3.
List out the uses of carbon dioxide.
Answer:

• Carbon dioxide helps plants in photosynthesis.
• It is used in fire extinguishers.
• It is used in refrigerators as dry ice for cooling purpose.
• It is used to make plastics and polymers

Samacheer Kalvi 4th Science Guide Air We Breath InText Questions and Answers

Activity (Text Book Page No. 88)

Question 1.
Take a squeezable bottle. Make a hole on the lid and close the bottle tightly. Bring the bottle near your face and press the bottle. What do you feel?
Answer:
Air will come rushing out of the bottle.

Let us do (Text Book Page No. 89)

From the given objects, find out the objects which has air in it.

Answer:

Let us do (Text Book Page No.90)

Tick (✓) the objects which gives out water vapour.
Question 1.

Answer:

Activity (Text Book Page No.91)

Question 1.
Write the percentage of the gases present in air.

Answer:

Activity (Text Book Page No.91)

Question 1.
You might have seen some huge colourful balloons flying high in malls. Those balloons are filled with nitrogen gas. Write the reason for filling nitrogen gas in balloons.
Answer:
The amount of nitrogen present in air is about 78% so it will float in air and will float upwards and it is also non-flammable gas.

Activity (Text Book Page No.93)

Classify the following

(Dog, cat, Coconut tree, monkey, brinjal plant, papaya plant)
Question 1.

Things which give out oxygen	Things which give out carbon dioxide

Answer:

Things which give out oxygen	Things which give out carbon dioxide
Brinjal plant	bog
Papaya plant	Cat
Coconut tree	Monkey

Activity (Text Book Page No.95)

Tick (✓) the causes of global warming

Answer:

Activity (Text Book Page No.96)

Question 1.
Write slogans on harmful effects of air pollution in a chart and stick it on the display board

1. Don’t be mean, keep air clean
2. Spread solution, not Pollution
3. Give trees a lot of care, so you can breath fresh air
4. Say Loudly ‘No’ to air pollution

Samacheer Kalvi 4th Science Guide Air We Breath Additional Questions and Answers

I. Choose the correct answers :

Question 1.
__________ is important for all living creatures.
(a) Dust
(b) Pure air
(c) Unclean air
Answer:
(b) Pure air

Question 2.
Air has no ___________ & __________.
(a) smell
(b) colour
(c) smell & colour
Answer:
(c) smell & colour

Question 3.
____________ gas is filled in tyres of vehicles.
(a) Oxygen
(b) Nitrogen
(c) Carbon dioxide
Answer:
(b) Nitrogen

Question 4.
____________ is used in gas welding, medicine manufacturing, constructions and transportation.
(a) Oxygen
(b) Nitrogen
(c) Carbon dioxide
Answer:
(a) Oxygen

II. Fill in the blanks :

Question 1.
____________ present in the air is needed for respiration.(Oxygen / Helium)
Answer:
Oxygen

Question 2.
Monsoon and rain occurs due to the ___________. (wind action / sun action)
Answer:
wind action

Question 3.
Composition of the component of air ___________ from place to place. (vary / Constant)
Answer:
vary

Question 4.
_____________ is the main component of air. (Carbon dioxide / Nitrogen)
Answer:
Nitrogen

Question 5.
The Scottish chemist ____________ discovered carbon dioxide is present in air. (Joseph priestly / Joseph black)
Answer:
Joseph black

III. True or False :

Question 1.
All living things use oxygen for breathing.
Answer:
True

Question 2.
The main component of air is oxygen
Answer:
False

Question 3.
Plants need nitrogen for growth.
Answer:
True

Question 4.
Nitrogen is essential for burning
Answer:
False

Question 5.
Air is important for ships and boats to sail.
Answer:
True

IV. Match the following :

Question 1.

Answer:

1. – d
2. – c
3. – e
4. – b
5. – a

V. Answer the following :

Question 1.
What is the mixture of air?
Answer:
The air consists of a mixture of gases oxygen, carbon dioxide, nitrogen, water vapour, dust and smoke.

Question 2.
What is moving air called?
Answer:
Moving air is called wind.

Question 3.
Do sailors need the help of wind to sail?
Answer:
Yes. Ships and boats sail on the sea with the help of the wind.

Question 4.
Name two example for wind instruments.
Answer:
The nathaswaram and the flute are some of the examples for wind instrument.

Question 5.
Which gas is essential for burning?
Answer:
Yes, Oxygen is very essential for burning.

Question 6.
What was the old name of nitrogen?
Answer:
“Noxious air”

Question 7.
What is the presence of harmful substance in the air called?
Answer:
Pollution.

Question 8.
How do we get cool water from a clay water pot on hot sunny days? Ans. Clay pot has thousands of tiny pores through which water seeps out. This causes cooling effect.

VI. Answer in detail :

Question 1.
Write a note on nitrogen
Answer:

• The amount of nitrogen present in air is about 78%
• It is used to fill up food packages to extend their shelf life.
• Liquid nitrogen is used to store living cells.
• Plants need nitrogen for their growth.
• We can see root nodules containing nitrogen in some plants.
• Nowadays people use nitrogen gas to fill the tyres of their vehicles.
• Some compounds of nitrogen are used as explosives also.

Question 2.
Explain carbon dioxide and its uses.
Answer:
The amount of carbon dioxide present in air is only 0.03%. Though it is less in percentage, its uses are more and essential. It can be tested with lime water. The lime water changes from colourless to milky.
Uses of carbon dioxide:

• Carbon dioxide helps plants in photosynthesis.
• It is used in fire extinguishers. ‘
• It is used in refrigerators as dry ice for cooling purposes.
• It is used to make plastics and polymers.

Tamilnadu State Board New Syllabus Samacheer Kalvi 4th English Guide Pdf Term 1 Prose Chapter 2 Do It Yourself Text Book Back Questions and Answers, Summary, Notes.

Tamilnadu Samacheer Kalvi 4th English Solutions Term 1 Prose Chapter 2 Do It Yourself

4th English Guide Do It Yourself Text Book Back Questions and Answers

Let us understand

A. Match their hobbies :

Question 1.

Answer:

B. Choose the correct answer :

Question 1.
__________ is a Do It yourself kid.
(a) Amuthan
(b) Vinoth
(c) Arasan
Answer:
(b) Vinoth

Question 2.
Rosy __________ a bicycle.
(a) Rides
(b) Folds
(c) Swims
Answer:
(a) Rides

Question 3.
Raju loves ___________.
(a) Cycling
(b) Driving
(c) Cooking
Answer:
(c) Cooking

C. Answer the following questions :

Question 1.
Who sews the cloth?
Answer:
Aliya sews the cloth.

Question 2.
What does Megalai do with elders?
Answer:
Megalai swims with elders.

Question 3.
How does Raju help his mother? How?
Answer:
Raju helps by cleaning grains and cereals. He prepare a few simple dishes.

Question 4.
What does DIY kid refer to ?
Answer:
DIY kid refers to Do It yourself kid.

Question 5.
What is your hobby?
Answer:
My hobby is photograhy.

Let us build

Homophones

Some words sound the same but their spelling and meaning are different. Such words are called homophones. There are many homophones.

உச்சரிப்பில் ஒரே மாதிரி இருந்தாலும், spelling மற்றும் அர்த்தத்தில் வேறுபட்டு உள்ள வார்த்தைகள் homophones என்று அழைக்கப்படும்.

Question 1.

Answer:

Question 2.

Answer:

Question 3.

Answer:

Question 4.

Answer:

A. Look at the picture and tick (✓) the correct word.

Question 1.

Answer:

Question 2.

Answer:

Question 3.

Answer:

Question 4.

Answer:

Question 5.

Answer:

Question 6.

Answer:

B. Connect and write the homophones in the box.

Question 1.

Answer:

C. Write the homophone for the given word and draw the picture.

Question 1.

Answer:

D. Pick out the correct option from the given homophones.

Question 1.
I saw a ______ (be/bee) on the flower.
Answer:
Bee

Question 2.
The wind ______ (below/blue) off the leaves.
Answer:
Blew

Question 3.
What did you ______ (buy/by) at the store?
Answer:
Buy

Question 4.
You should never ______ (lye/lie) to your parents.
Answer:
Lie

Pick out the correct option from the given homophones Additional Questions and Answers

Question 1.
Have you read the tortoise and the ______ (hair/hare) story?
Answer:
Hare

Question 2.
Vanitha has long ______(hair/hare)
Answer:
Hair

Question 3.
Ravi is _____ (week/weak) in maths.
Answer:
Weak

Question 4.
There is a _____ (whole/hole) in your shirt.
Answer:
Hole

Question 5.
The security will ______ (cheque/check) your bag.
Answer:
Check

Question 6.
You should not ______ (brake/break) the law.
Answer:
Break

Question 7.
The _____ (brake/break) did not work.
Answer:
Brake

Question 8.
Our ______ (principle/principal) is a kind person.
Answer:
principal

Question 9.
He was a man of ______ (principle/principal).
Answer:
principle

Question 10.
The government increased the bus ______ (fair/fare).
Answer:
Fare

4th English Guide Do It Yourself Additional Questions and Answers

Connect the following :

Answer the following:

Question 1.
Who loves gardening?
Answer:
James loves gardening.

Question 2.
When did Rosy learn to ride a bicycle?
Answer:
Rosy learnt to ride a bicycle when she was nine years old.

Question 3.
Name the kid, who washes his own clothes?
Answer:
Vinoth washes his own clothes.

Question 4.
Who hems the border?
Answer:
Aliya hems the border.

Do It Yourself Summary in English and Tamil

Hi, I am Vinoth.When I was young, my parents and other elders did everything for me. Now

• I wash my own clothes.
• I fold all clothes neatly.
• I love to do my work on my own.
• I am a DIY kid.

ஹாய், நான்தான் வினோத், நான் சிறுவனாக இருந்தபோது, என் பெற்றோரும், மூத்தவர்களும எனக்காக எல்லாமே செய்தார்கள்,இப்போது .

• நான் எனது துணிகளை
• துவைக்கிறேன்
• எல்லா துணிகளையும்
• நேர்த்தியாக நான் மடிக்கிறேன்.

Okay… Let me introduce my friends and their hobbies.

சரி… நான் என் நண்பர்களை அறிமுகப்படுத்தி, அவர்களது பொழுதுபோக்குகளைக் கூறுகிறேன்.

Hi, I am Rosy.

• I learnt to ride a bicycle when I was 9 years old…
• I ride my bicycle every day.
• I enjoy cycling.

ஹாய், நான் ரோஸி.

• என் 9வது வயதில் நான் சைக்கிள் ஓட்ட கற்றுக்கொண்டேன்.
• நான் என் சைக்கிளை தினமும் ஓட்டுகிறேன்.
• நான் சைக்கிள் ஓட்டுவதில் மகிழ்ச்சியடைகிறேன்.

Hi, I am Megalai.

• I swim with elders in a well.
• I compete with them.
• I am fond of swimming.

ஹாய், நான் மேகலை.

• பெரியவர்களுடன் ஒரு கிணற்றில் நான் நீந்துகிறேன்.
• நான் அவர்களுடன் போட்டியிடுகிறேன்.
• எனக்கு நீச்சல் பிடிக்கும்

Hi, I am James.

• I have my own garden.
• I water it every day.
• I love gardening.

ஹாய், நான் ஜேம்ஸ்.

• எனக்கென்று சொந்தமாக தோட்டம் உள்ளது.
• நான் தோட்டத்தில் தினமும் நீர் பாய்ச்சுகிறேன்.
• நான் தோட்டக்கலையை விரும்புகிறேன்.

Hi, I am Aliya.

• I sew my torn clothes.
• I hem the border.
• I am always keen to stitch.

ஹாய், நான் அலியா.

• எனது கிழிந்த துணிகளை நான் தைப்பேன்
• நான் ஓரங்களை மடக்கி தைப்பேன்.
• நான் தைப்பதற்கு எப்போதும் ஆர்வத்துடன் இருப்பேன்.

Hi, I am Raju.

• I help by cleaning grains and cereals.
• I am good at cooking.
• I like slicing, cutting or chopping fruits a vegetables.
• I prepare a few simple dishes.

ஹாய், நான் ராஜு.

• நான் தானியங்களை (கழுவி) சுத்தம் செய்ய உதவுகிறேன்.
• சமைப்பதில் நான் தேர்ந்தவன்.
• பழங்களையும், காய்கறிகளையும், துண்டுதுண்டாக நறுக்க, வெட்ட, சீவ, எனக்கு பிடிக்கும்.
• ஒரு சில எளிமையான உணவுகளை நான் தயாரிப்பேன்.

Do It Yourself Glossary

DIY kid – Do It yourself kid. Someone who does any work on their own
Sew – Making stitches with a needle
Cereals – Grains used for food
Slicing – Cut into slices
Compete – Vie
Elders – Seniors
Neatly – orderly
Ride – drive
Stitch – sew
Torn – ragged

Tamilnadu State Board New Syllabus Samacheer Kalvi 4th English Guide Pdf Term 1 Prose Chapter 1 The Trick Robot Text Book Back Questions and Answers, Summary, Notes.

Tamilnadu Samacheer Kalvi 4th English Solutions Term 1 Prose Chapter 1 The Trick Robot

4th English Guide The Trick Robot Text Book Back Questions and Answers

Let us understand

A. Choose the correct option :

Question 1.
Vicky wanted a ___________ to do all his work.
(a) Toy
(b) Friend
(c) Robot
Answer:
(c) Robot

Question 2.
Vicky’s father bought a ____________ robot.
(a) Lazy
(b) Trick
(c) Active
Answer:
(b) Trick

Question 3.
Vicky decided to ____________ the robot at the end.
(a) Keep
(b) Sell
(c) Praise
Answer:
(b) Sell

Question 4.
Robot asked Vicky to sell him to an ___________ master.
(a) Lazy
(b) Active
(c) Passive
Answer:
(b) Active

B. Read the statement and write True or False :

Question 1.
Vicky pleaded his father to buy a robot.
Answer:
True

Question 2.
Vicky was an active boy.
Answer:
False

Question 3.
The robot did not obey his master.
Answer:
True

Question 4.
Vicky’s father decided to change his son’s character.
Answer:
True

C. Answer the questions :

Question 1.
What kind of a boy was Vicky?
Answer:
Vicky was a lazy boy and never did his homework on time.

Question 2.
Who asked the Robot to charge the phone?
Answer:
Vicky asked the Robot to Charge the phone.

Question 3.
Whom did Vicky want to do all his work?
Answer:
Vicky wanted Robot to do all his work.

Question 4.
How did Vicky change at the end?
Answer:
Vicky said that he would do all the work himself.

Question 5.
What did you learn from this lesson?
Answer:
We should be active and not lazy.

D. Match the dialogue to the character :

Question 1.

Answer:

E. Name the character or speaker :

Question 1.
“The robot will do all your work.”
Answer:
Vicky’s father

Question 2.
“Why don’t you do that yourself?”
Answer:
Robot

Question 3.
“You want me to strain my back?”
Answer:
Robot

Question 4.
“Play me a pleasant song.”
Answer:
Vicky

Name the character or speaker Additional Questions and Answers

Question 1.
“That’s a great idea!”.
Answer:
Robot

Question 2.
“I am hungry”.
Answer:
Vicky

Question 3.
“You cannot refuse me”
Answer:
Vicky

Question 4.
“I must make some calls”.
Answer:
Robot

Question 5.
“I am tired of you”.
Answer:
Vicky

Let us build

A naming word which is used for one person or thing is called singular.
A naming word which denotes more than one person or thing is called plural.

Some tips to change singular to plural

Question 1.
Simple add ‘s’.
Answer:

Question 2.
Add ‘es’ for the naming words ending with ch, sh, s, ss and x.
Answer:

Question 3.
Simply add ‘s’ if any one of a, e, i, o, u comes before y.
Answer:

Question 4.
Change the y into ies, if any one of a, e, i, o, u does not come before y.
Answer:

Tick (✓) the correct plural form. 

Question 1.

Answer:

Question 2.

Answer:

Question 3.

Answer:

Question 4.

Answer:

Question 5.

Answer:

Question 6.

Answer:

Write the plural form.

Question 1.

Answer:

Question 2.

Answer:

Question 3.

Answer:

Question 4.

Answer:

Write the plural form Additional Questions and Answers

Question 1.
Write the plural form.

Answer:

InText Question – Think

Question 1.
Do you think it is a good robot?
Answer:
Yes. I think it is a good robot. It has changed Vicky to be an active boy.

Additional Questions

Question 1.
Does a robot eat salad?
Answer:
No. A robot cannot eat salad.

Question 2.
What type of master did the robot want
Answer:
The robot wanted an active master.

The Trick Robot Summary in English and Tamil

Vicky was a lazy boy. He never did his homework on time. He never kept his things back in the right place. He pleaded to his father to buy him a robot to do his work. Vicky’s father wanted him to become an active boy. So, he bought him a trick robot. Vicky did not know that it was a trick robot. He was glad to have a robot to do all his work.

தந்திரசாலி ரோபோ  விக்கி ஒரு சோம்பேறி. ஒருபோதும் அவன் தன் வீட்டுப்பாடத்தை சரியான நேரத்திற்கு  செய்ததில்லை. எடுத்த பொருளை சரியான இடத்தில் அவன் திரும்ப வைத்தில்லை. தன்னுடைய வேலைகளையெல்லாம் செய்துதர ஒரு ரோபோவை வாங்கித்தரும்படி அவன் தன் அப்பாவிடம் கெஞ்சினான்.

அவன் ஒரு சுறுசுறுப்பான பையனாக வர வேண்டுமென அவனது அப்பா விரும்பினார். ஆகவே அவர் தந்திரசாலியான ஒரு ரோபோவை அவனுக்காக வாங்கினார். அது ஒரு தந்திரசாலி ரோபோ என்பது விக்கிக்கு தெரியாது. தன் வேலைகளை எல்லாம் செய்ய ஒரு ரோபோ கிடைத்ததை எண்ணி அவன் மகிழ்ச்சியடைந்தான்.

Father: Vicky, I have bought you a robot. This intelligent robot will do all your work. Enjoy!

தந்தை: விக்கி, நான் உனக்கு ஒரு ரோபோ வாங்கியிருக்கிறேன். இந்த புத்திசாலி ரோபோ உன் எல்லா வேலைகளையும் செய்யும்.

Vicky is excited to test his new robot.

அனுபவி! விக்கி தன் புதிய ரோபோவை சோதித்துப்பார்க்க ஆர்வப்பட்டான்.

Vicky: I am hungry. Cook some salad for me.

விக்கி: நான் பசியாக இருக்கிறேன். எனக்கு ஏதாவது கொஞ்சம் சாலட் செய்து கொடு.

Robot: I do not eat salad. So, I cannot make the salad.

ரோபோ: நான் சாலட் சாப்பிடுவதில்லை. ஆகவே என்னால் சாலட் செய்ய முடியாது.

Vicky: What? You are a robot. You cannot refuse me. Clean my room now!

விக்கி: என்ன? நீ ஒரு ரோபோ! நான் சொல்வதை நீ நிராகரிக்க முடியாது. இப்போது என் அறையை சுத்தம் செய்.

Robot: Do you want me to strain my back? I cannot do that.

ரோபோ: என் முதுகுபாதிக்கப்படவேண்டுமென நீ விரும்புகிறாயா? அதை என்னால் செய்ய முடியாது.

Vicky: Really? I cannot believe this! At least, charge my phone.

விக்கி: உண்மையாகவா? இதை என்னால் ‘நம்பமுடியவில்லை. குறைந்தபட்சம். என் கைபேசியையாவது சார்ஜ் செய்து கொடு.

Robot: Why don’t you do that yourself? I must make some calls.

ரோபோ: அதை ஏன் நீயே செய்யக்கூடாது? நான் சிலரிடம் போனில் பேச வேண்டியுள்ளது.

Vicky: Aah! I have a headache now. Get me a cup of hot tea.

விக்கி: ஆ! இப்போது எனக்கு தலை வலிக்கிறது. போய் சூடாக ஒரு தேநீர் கொண்டு வா.

Robot: My battery is draining by listening to you. First, you charge my battery.

ரோபோ: உன் பேச்சை நான் கவனித்ததாலேயே என் மின்கலத்தின் சக்தி குறைந்து போய்விட்டது. முதலில் என் மின்கலத்தை சார்ஜ் செய்.

Vicky: I am tired of you! Play me a pleasant song. I want to relax.

விக்கி: உன்னுடன் பேசி நான் களைத்து விட்டேன். ஒரு சந்தோஷமான பாட்டைப் போடு. நான் ஓய்வெடுக்க விரும்புகிறேன்.

Robot: That’s a great idea! Why don’t you play me one?

ரோபோ: அது ஒரு சிறந்த ஐடியா. எனக்காக நீ ஏன் ஒரு பாட்டு போடக்கூடாது?

Vicky : Oh no! Dad! Please sell this robot. It is totally useless.

விக்கி: அப்பா! தயவு செய்து இந்த ரோபோவை விற்றுவிடுங்கள். இதனால் ஒரு பயனுமில்லை.

Robot: Yes. This time please sell me to an active master. I don’t want to work for lazy people.

ரோபோ: ஆம். இந்தமுறை தயவுசெய்து என்னை ஒரு சுறுசுறுப்பான மாஸ்டருக்கு விற்றுவிடுங்கள். சோம்பேறிகளுக்கு வேலை செய்ய நான் விரும்பவில்லை.

Vicky: Really? Is that why you did not help me?

விக்கி: உண்மையாகவா? அதனால் தான் நீ எனக்கு உதவவில்லையா?

Vicky: No more robots for me! I will do all the work myself.

விக்கி: எனக்கு இனி ரோபோக்கள் தேவையில்லை. என் எல்லா வேலைகளையும் நானே செய்துகொள்வேன்.

The Trick Robot Glossary:

Plead = request / கெஞ்சி கேட்டல்
Refuse = disagree or reject / நிராகரித்தல்
Pleasant = happy / சந்தோஷமான
Active = energetic / சுறுசுறுப்பான
Believe = accept as true / உண்மை என்று ஏற்றுக்கொள்ளுதல்
Draining = becoming empty / காலியாதல்
Excited = thrilled / உற்சாகமும் ஆர்வமும் கொள்ளுதல்
Hungry = in need of food / பசி
Intelligent = clever / புத்திசாலி
Never = at no time / ஒருபோதும்
Relax = rest / ஓய்வு எடுத்தல்

Tamilnadu State Board New Syllabus Samacheer Kalvi 4th Science Guide Pdf Term 1 Chapter 1 My body Text Book Back Questions and Answers, Notes.

Tamilnadu Samacheer Kalvi 4th Science Solutions Term 1 Chapter 1 My body

Samacheer Kalvi 4th Science Guide My Body Text Book Back Questions and Answers

I. Pick out the odd one :

Question 1.
1. Heart
2. Legs
3. Brain
4. Kidney
Answer:
2. Legs

Question 2.
1. Eyes
2. Ears
3. Fingers
4. Lungs
Answer:
4. Lungs

Question 3.
1. Fore brain
2. Mid brain
3. Hind brain
4. Nerves
Answer:
4. Nerves

II. Complete the figure with words given in the bracket :

(Kissing on the mouth, Grand parents’ love, Hitting the buttocks, Pat of dad on head, Parent’s hug and kisses, Showing awkward pictures)

Question 1.

Answer:

III. Find the answers from the following clues and circle the words (First one is done for you)

Question 1.
1. An internal organ.
2. Organ that helps us to breath.
3. An organ removing wastes from our body,
4. Unfair and unhealthy touch.
5. Everyday we should drink more ___________ .

Answer:

1. Heart
2. Lungs
3. Kidney
4. Bad Touch
5. Water

IV. Say true or false :

Question 1.
Head, hand and legs are internal organs.
Answer:
False

Question 2.
Heart is made up of muscles.
Answer:
True

Question 3.
Muscles are the soft parts that cover our bones.
Answer:
True

Question 4.
Brush your teeth once a day.
Answer:
False

Question 5.
Father patting you on your head is a good touch.
Answer:
True

V. Choose the correct answer :

Question 1.
____________ is the commanding centre of our body.
(a) Heart
(b) Lungs
(c) Kidney
(d) Brain
Answer:
(d) Brain

Question 2.
Food is converted to energy in the _____________.
(a) Neck
(b) Heart
(c) Stomach
(d) Nose
Answer:
(c) Stomach

Question 3.
Every day we should brush our teeth __________ times.
(a) One
(b) Two
(c) Three
(d) Four
Answer:
(b) Two

Question 4.
Good touch is a fair and ___________ touch.
(a) Unhealthy
(b) Bad
(c) Unsafe
(d) Healthy
Answer:
(d) Healthy

Question 5.
Drink a lot of every day.
(a) Oil
(b) Water
(c) Packed juice
(d) Salt water
Answer:
(b) Water

VI. Answer the following questions in one or two sentences :

Question 1.
Name the internal organs.
Answer:
Some body parts such as stomach, lungs and heart that are inside our body, these parts are called internal organs.

Question 2.
What are the functions of brain?
Answer:
Brain is the commanding centre of our body.

• It controls all activities of our body like moving our hands and legs sitting or walking.
• It helps us to think and perform various actions.

Question 3.
List out the food items for healthy mouth and teeth.
Answer:

• Drink water or milk instead of sugar juices.
• Take plenty of fruits, vegetables and dairy products.
• Eat candy, cake and ice cream as less as possible.

Question 4.
How will you take care of your heart and kidney?
Answer:

• For healthy Heart – Stay away from processed food. Choose fresh fruit and vegetable.
• For healthy Kidney – Drink plenty of fluid (water & Juice).

Question 5.
What do you do when some one touches you and you feel uncomfortable?
Answer:

• Say “Don’t touch” in a loud voice.
• Leave the spot quickly.
• Tell elders like your parents or teachers till you get help.

VII. Think and answer :

Question 1.
When an unknown person disturbs you, how do you behave? Write in your own words.

• I must never be afraid, to shout and say, Don’t touch me”.
• Must leave the spot quickly.
• Must tell elders like father or mother or teacher to get help.

Question 2.
Which organ controls thinking, speaking and learning. Write its three important parts.
Answer:
The organ that controls thinking,speaking and learning is ‘Brain’.
The three important parts of Brain are

1. Fore brain
2. Mid brain
3. Hind brain

Samacheer Kalvi 4th Science Guide My Body InText Questions and Answers

Let us Recall (Text Book Page No. 82)

Question 1.
There are some body parts hidden in the table below. Can you spot them?

Answer:

1. Hear
2. Nose
3. Ears
4. Leg
5. Hand

Try to Answer (Text Book Page No. 83)

Question 1.
______ (Nose / Brain) is an internal organ.
Answer:
Rain

Question 2.
We can see the internal body parts (True / False).
Answer:
False

Try to Answer (Text Book Page No. 86)

Match the following :

Question 1.

Answer:

1. – e
2. – a
3. – b
4. – c
5. – d

Try to Answer (Text Book Page No. 89)

Tick (✓) the foods that are good for your teeth and cross (✗) the food that are bad for your teeth.

Question 1.

Answer:

Try to Answer (Text Book Page No. 90)

Question 1.
Is it Good touch or Bad touch? Why?

Answer:
(A) Bad touch – It is the kind you don’t like and want it to stop.
(B) Good touch – It is a way for people to show they care and help for each other.

Try to Answer (Text Book Page No. 92)

Look at the picture and write ‘Good touch’ or ‘Bad touch’.
Question 1.

Answer:

Samacheer Kalvi 4th Science Guide My body Additional Questions and Answers

Question 1.
fore brain, mid brain, hind brain, centre brain
Answer:
Center brain

Question 2.
spongy, J-shaped, contract, expand
Answer:
J-shaped

Question 3.
bean shaped, purify blood, filtering, breath in
Answer:
Bean shaped

Write True or False :

Question 1.
Brain is protected by skull.
Answer:
True

Question 2.
We have three kidneys.
Answer:
False

Question 3.
Lungs help us to breath.
Answer:
True

Question 4.
When we breath in, the lungs become bigger.
Answer:
True

Question 5.
We breath out, we give out oxygen from the lungs.
Answer:
False

Question 6.
Lungs pumps blood to all parts of the body.
Answer:
False

Match the following :

Question 1.

Answer:
1. – b
2. – a
3. – d
4. – c

Fill the blanks :

Question 1.
When we breath out, we give out __________ from the lungs.
(a) Carbon dioxide
(b) Oxygen
(c) Nitrogen
(d) Hydrogen
Answer:
(a) Carbon dioxide

Question 2.
The heart beat about __________ in a minute.
a) 71 times
b) 72 times
c) 62 times
d) 60 times
Answer:
(b) 72 times

Question 3.
How many kidneys does the human body have?
(a) 2
(b) 1
(c) 3
(d) 4
Answer:
(a) 2

Question 4.
How many bones are there in an adult human being?
(a) 210
(b) 260
(c) 206
(d) 201
Answer:
(c) 206

Question 5.
The main function of the kidney is
(a) To control blood pressure
(b) To control body temperature
(c) To remove waste product from the body
(d) To help in digestion of food.
Answer:
(c) To remove waste product from the body

Question 6.
How many bone are there is a newly born infant
(a) 206
(b) 230
(c) 280
(d) 300
Answer:
(d) 300

Question 7.
Which is the largest organ in the human body?
(a) Liver
(b) Heart
(c) Skin
(d) Kidney
Answer:
(c) Skin

V. Fill in the blanks.

Question 1.
Stomach is a __________ bag found below the lungs.
Answer:
J-shaped

Question 2.
Heart is made up of _________.
Answer:
Muscles

Question 3.
Stomach contains special juice to breakdown ___________ into energy.
Answer:
Food

Question 4.
The kidneys purify __________.
Answer:
Blood

VI. Answer the following questions in one r two sentences :

Question 1.
Draw a human heart and colour the picture.
Answer:

Question 2.
What happens to the lungs when we breathe in?
Answer:

• When we breath in, we take in oxygen from air through the nose and pass it to the lungs.
• The lungs expands (becomes big) in the position.

Question 3.
What is milk teeth?
Answer:

• The first set of teeth starts to develop from the age of six months.
• They are called milk teeth and they are 20 in number.

Question 4.
Name the four types of the permanent teeth.
Answer:
There are four types of teeth: Incisors, Canines, Premolars and Molars.

Question 5.
How do you take care of your mouth and teeth?
Answer:

• Change toothbrush once in every three months.
• Avoid sticky food.
• Brush twice a day. (After getting up and before going to bed)
• Rinse your mouth with water every time after you eat.

Question 6.
List out the activities related to bad touch.
Answer:

• Touching the buttocks and other private parts.
• Hitting, slapping, spitting, pushing or punching, kissing.
• Activities that make you feel scared or nervous or ashamed.
• Dirty talk and dirty pictures.

Tamilnadu State Board New Syllabus Samacheer Kalvi 4th Science Guide Pdf Term 3 Chapter 1 Green Environment Text Book Back Questions and Answers, Notes.

Tamilnadu Samacheer Kalvi 4th Science Solutions Term 3 Chapter 1 Green Environment

Samacheer Kalvi 4th Science Guide Green Environment Text Book Back Questions and Answers

I. Choose the correct answer :

Question 1.
What is the first step in waste management?
(a) Waste disposal
(b) Waste separation
(c) Waste collection
Answer:
(b) Waste separation

Question 2.
Which is an example for non-biodegradable waste?
(a) Paper cup
(b) Plastic cup
(c) Coconut shell
Answer:
(b) Plastic cup

Question 3.
Picking up the waste is called ____________
(a) Waste collection
(b) The environment
(c) Litter
Answer:
(a) Waste collection

Question 4.
___________ is the first ‘R’ in the Three R’s.
(a) Reuse
(b) Reduce
(c) Recycle
Answer:
(b) Reduce

II. Fill in the blanks :

Question 1.
_____________ is an example of reusing waste. (Using old jars for pickle / Saying not to a plastic bag)
Answer:
Using old jars for pickle

Question 2.
____________ is used to make bags, dustbins and tooth brushes. (Rose / Bamboo)
Answer:
Bamboo

Question 3.
____________ is a big threat to our environment. (Plastic pollution / Light pollution)
Answer:
Plastic pollution

Question 4.
___________ is a non-recyclable item. (Glass / Multilayer plastics)
Answer:
Multilayer -plastics

III. Match the following :

Question 1.

Answer:

IV. Write True or False :

Question 1.
3R method reduces the amount of waste that goes to landfills.
Answer:
True

Question 2.
Eco-friendly material is harmful to the environment.
Answer:
False

Question 3.
Plastic bag, thermocol and multilayer plastics are recyclable.
Answer:
False

Question 4.
We should not separate our waste.
Answer:
False

V. Answer in one or two sentences :

Question 1.
What are the Three R’s?
Answer:
The three R’s stand for REDUCE, REUSE, RECYCLE.

Question 2.
What is bio-degradable waste?
Answer:
Bio-degradable waste is a form of waste, originating naturally from plant
or animal sources, which may be degraded by other living organisms.

Question 3.
Write the different steps in waste management.
Answer:

• Separation of waste
• Waste collection and transportation
• Waste recycling and composting
• Waste disposal

Question 4.
Name five items which are recyclable.
Answer:
Paper, glass, metal, cardboard and plastic covers.

VI. Answer the following :

Question 1.
How will you manage the household waste?

• Divide the waste into different waste bins.
• Each bin should have different type of wastes.
• Green for biodegradable waste, Blue for recyclable waste and Red for non-recyclable waste.

Question 2.
What are the plastic items that have been banned in Tamil Nadu?
Answer:
Plastic bags, plastic plates, water pouches, plastic straws, plastic sheets.

Question 3.
Write the benefits of recycling.
Answer:

• Old newspapers, note books and magazines are sold to a scrap dealer. They will be made into new paper.
• PET bottles are recycled into plastic threads and used to make sports T-shirts.
• Old glass bottles and broken glass pieces are melted to make new glass.
• Broken metal items like tiffin boxes and plates are melted and made into new metal products like toys.

Question 4.
What is known as eco-friendly material?
Answer:
Materials which are beneficial to the environment and do not cause harm are called eco-friendly materials

Samacheer Kalvi 4th Science Guide Green Environment In Text Questions and Answers

Activity (Text Book Page No. 65)

Question 1.
Write the waste management process in the correct order.
(Waste disposal, Waste collection and transportation, Waste separation, Waste recycling and composting)
Answer:

1. Waste separation
2. Waste collection & transportation
3. Waste recycling A composting
4. Taste disposal

Activity (Text Book Page No. 67)

Question 1.
List out four things that you can reduce, reuse and recycle at home or school.

Reduce	Reuse	Recycle

Answer:

Reduce	Reuse	Recycle
Use of plastic carry bags	Old clothes to clean home & cycle	Old newspapers, notebook, magazine
Buy food in bulk & avoid plastic bags	Use jam & pickle jars to store things.	Old glass bottles to make new bottles
Buy a refill instead of a pen	Clothes that look good can be donated to poor	Broken metal items to make toys
Turn off lights and fans when you leave a room	Reuse waste & make something new	Pet bottle to make plastic thread

Activity (Text Book Page No. 70)

Study the images below and write down three items you have at home in each category of waste.

Question 1.

Answer:
Biodegradable: Vegetable peels, fruit peels, mat

Question 2.

Answer:
Recyclable: Glass, metal, paper & cardboards

Question 3.

Answer:
Non-recyclable : Plastic baas, CFL lights, mixed electronic wastes

Activity (Text Book Page No. 74)

Question 1.
Write any five non-recyclable items that you use or*have seen in shop.
Answer:
CFL lights, plastic bags, mixed electronic wastes, medical wastes, polyester.

Samacheer Kalvi 4th Science Guide Green Environment Additional Questions and Answers

I. Choose the correct answers :

Question 1.
Unwanted materials pollute our ___________
(a) Land
(b) Air
(c) Both a and b
Answer:
(c) Both a and b

Question 2.
____________ is the very important step in waste management.
(a) Separation of waste
(b) Waste disposal
(c) Waste collection
Answer:
(a) Separation of waste

Question 3.
_______________ is to take materials from things you throw away and make new products with them.
(a) Reduce
(b) Reuse
(c) Recycle
Answer:
(c) Recycle

Question 4.
____________ can return back to the soil and become food for plants.
(a) Biodegradable
(b) Non-degradable
(c) Recyclable
(d) None
Answer:
(a) Biodegradable

Question 5.
_____________ is an example for eco-friendly material.
(a) Leaf plate
(b) Plastic plate
(c) Thermocol plate
Answer:
(a) Leaf plate

II. Fill in the blanks :

Question 1.
Picking up the waste is called ___________ (waste disposal / waste collection)
Answer:
waste collection

Question 2.
____________ waste can be turned into something new which is valuable. (Recyclable / Non – recyclable)
Answer:
Recyclable

Question 3.
is using something repeated for the same or for another purpose. (Reuse / Reduce)
Answer:
Reuse

Question 4.
___________ of our environment means to protect all things found in nature. (Observation / Conservation)
Answer:
Conservation

Question 5.
Plastic bags and food packaging is a _____________ item. (non-recyclable / recyclable)
Answer:
Non-recyclable

III. True or false :

Question 1.
It is best to separate waste into 3 different bins.
Answer:
True

Question 2.
Reuse is to make or use less
Answer:
False

Question 3.
Broken glass pieces are melted to make new glass.
Answer:
True

Question 4.
We should conserve our natural resources and energy
Answer:
True

IV. Answer the following :

Question 1.
What is separation of waste?
Answer:
It means to sort or divide the waste into different waste bins.

Question 2.
What is waste collection?
Answer:
Picking up the waste by our municipality or corporation is called waste collection.

Question 3.
What is transportation?
Answer:
Moving the waste from one place to another is called transportation.

Question 4.
What is compost?
Answer:

1. Compost is the decayed organic material which is obtained from the biodegradable waste.
2. Compost makes the soil fertile.

Question 5.
What is waste disposal or final disposal?
Answer:
The waste that cannot be recycled (non-recyclable waste) needs to be sent for final disposal.

Question 6.
What is Reduce?
Answer:
Reduce is to make or use less materials.

Question 7.
What is Reuse?
Answer:
Reuse is using a thing repeatedly for the same or for another purpose.

Question 8.
What is Recycle?
Answer:
Recycle is to take materials from things you throw away and make new products by using them.

Question 9.
Name some materials that you can at home recycle?
Answer:

• PET bottles
• Old glass bottles and broken glass pieces
• Broken metal items

V. Answer in detail :

Question 1.
Write down the eco-friendly activities.
Answer:

• Reduce your paper use by writing on both sides of every sheet.
• Stop using plastic straws.
• Use reusable bag.
• Give up chewing gum.
• Buy stainless steel bottles instead of plastic water bottles.
• Reuse containers for storing left overs.

Question 2.
What is meant by conservation of environment?
Answer:

• Conservation of environment means to protect all things found in nature.
• It means that we have to use our Earth’s natural resources (like water, soil, minerals, wildife and forests) carefully.
• Everyone can conserve the environment by good waste management habits.

Tamilnadu State Board New Syllabus Samacheer Kalvi 4th Social Science Guide Pdf Term 2 Chapter 2 Physical Features of Tamil Nadu Text Book Back Questions and Answers, Notes.

Tamilnadu Samacheer Kalvi 4th Social Science Solutions Term 2 Chapter 2 Physical Features of Tamil Nadu

Samacheer Kalvi 4th Social Science Guide Physical Features of Tamil Nadu Text Book Back Questions and Answers

I. Choose the correct answer :

Question 1.
Which wildlife sanctuary is located in Tamil Nadu?
(a) Mudumalai wildlife sanctuary
(b) Corbett national park
(c) Sunderbans national park
(d) Ranthambore national park
Answer:
(a) Mudhumalai wildlife sanctuary

Question 2.
Western ghats and Eastern ghats meet at ____________ .
(a) Aravalli range
(b) Nilgiri hills
(c) Himalayan range
(d) Vidhyas range
Answer:
(b) Nilgiri hills

Question 3.
The topmost branches of trees form a chain called ____________ .
(a) sunlight
(b) canopy
(c) forest
(d) mangrove
Answer:
(b) canopy

Question 4.
Tamil Nadu experiences _____________ .
(a) extreme winters
(b) highest rainfall
(c) tropical climate
(d) snow fall
Answer:
(c) tropical climate

Question 5.
_________ are found in the places where, there is heavy rainfall.
(a) Deciduous forests
(b) Swamp forests
(c) Evergreen forests
(d) None of them
Answer:
(d) None of them

II. Match the following :

Question 1.

Answer:

III. True or False :

Question 1.
Tamil Nadu is the eleventh largest state in india.
Answer:
True

Question 2.
Tamil Nadu is located in the west of India.
Answer:
False

Question 3.
Kurunji flowers blossom once in 2 years.
Answer:
False

Question 4.
Tamil Nadu experiences hot and humid weather throughout the year.
Answer:
True

Question 5.
Deciduous forests do not shed leaves.
Answer:
False

IV. Answer in brief :

Question 1.
Name the states that Tamil Nadu shares boundary with.
Answer:

1.  Andhra Pradesh
2.  Karnataka
3.  Indian Ocean, Kerala
4.  Bay of Bengal

Question 2.
What are the different landscapes of Tamil Nadu?
Answer:
The landscape of Tamil Nadu can be divided into four categories namely:

1.  Mountains
2.  Plateaus
3.  Plains
4.  Coast

Question 3.
What are the different plains in Tamil Nadu?
Answer:
Plains in Tamil Nadu can be divided into river plains and coastal plains.

Question 4.
Name the waterfalls in Tamil Nadu.
Answer:

1.  Hogenakkal falls
2.  Courtallam falls
3.  Suruli waterfalls
4.  Vattaparai falls

Question 5.
Describe the climate of Tamil Nadu.
Answer:
Tamil Nadu experiences tropical climate and there is very little difference between summer and winter. The temperature during summer can rise up to A0°C (40 degree Celsius). Due to its location, Tamil Nadu experiences hot and humid weather almost throughout the year with mild winter. Tamil Nadu is dependent on monsoon rains and often faces droughts if monsoon fails.

Question 6.
Differentiate evergreen forests and deciduous forests.
Answer:

Evergreen forests	Deciduous forests
1. These forests are also known as Tropical rain forests.	These forests are also known as Monsoon forests.
2.  These forest do not shed their leaves.	These forests shed their leaves during summer.
3. These forests are found in areas receiving more than 200 cm of annual rainfall	These forests are found in areas receiving annual rainfall between 70-200 cm.

Intext activity

Activity 1.

Question 1.
On the political map of India shade any two neighbouring states of Tamil Nadu.

Question 2.
Mark the Indian ocean, the Arabian Sea and the Bay of Bengal on the map.
Answer:

Activity 2.

Question 1.
On the district map of Tamil Nadu any three coastal districts of Tamil Nadu.

Try to answer

Question 1.
Where do the Western ghats and Eastern ghats meet?
Answer:
Nilgiris hills

Question 2.
Name any two wildlife sanctuaries in the Western ghats of Tamil Nadu.
Answer:

1. Mudumalai wildlife sanctuary
2. Indira Sandhi wildlife sanctuary

Question 3.
Name some important rivers in Tamil Nadu
Answer:

• Palar
• Cheyyar
• Pennar
• Kaveri
• Vaigai
• Thamirabarani

Question 4.
Where is Courtallam waterfalls located?
Answer:
Courtallam waterfalls is located in Tenkasi.

Question 5.
During which months does the State receive rainfall from South West monsoon?
Answer:
June to September

Question 6.
Describe the weather of Tamil Nadu in a sentence.
Answer:
Tamil Nadu experiences hot and humid weather almost throughout the year with mild winter.

Samacheer Kalvi 4th Social Science Guide Physical Features of Tamil Nadu Additional Questions and Answers

I. Choose the correct answer:

Question 1.
______ is situated at the Northern end of Tamil Nadu.
(a) Pulicat lake
(b) Aravalli range
(c) Suruli waterfalls
(d) Pamban bridge
Answer:
(a) Pulicat lake

Question 2.
The landscape of Tamil Nadu can be divided into ____________ categories.

(a) two
(b) three
(c) four
(d) five
Answer:
(c) four

Question 3.
Courtallam falls is located in _____________ .
(a) Tenkasi
(b) Theni
(c) Kanniyakumari
(d) Dharmapuri
Answer:
(a) Tenkasi

Question 4.
____________ is also called the Megamalai falls.
(a) Hogenakkal falls
(b) Courtallam falls
(c) Suruli waterfalls
(d)Vattaparai falls
Answer:
(c) Suruli waterfalls

Question 5.
The Pichavaram mangrove forest is located near ____________ in Tamil Nadu.
(a) Chidambaram
(b) Ramanathapuram
(c) Dharmapuri
(d) Theni
Answer:
(a) Chidambaram

II. Match the following :

Question 1.

Answer:

1. – e
2. – d
3. – a
4. – b
5. – c

III. True or False :

Question 1.
Tamil Nadu is located in the South of India.
Answer:
True

Question 2.
Dottabetta is the smallest peak.
Answer:
False

Question 3.
Kurunji flowers blossom only once in 10 years.
Answer:
False

Question 4.
The coastal region extends from Chennai to Kanniyakumari
Answer:
True

Question 5.
Marina Beach, the second largest urban beach in the world.
Answer:
True

Question 6.
Hogenakkal falls is called Niagara of India.
Answer:
True

IV. Answer in brief :

Question 1.
Describe the mountains of Tamil Nadu.
Answer:
Tamil Nadu is the only state in India which has both the Western ghats and Eastern ghats. They meet at the Nilgiri hills, form a part of the Western ghats of Tamil Nadu. Doddabetta is the highest peak.

Question 2.
Name the hill stations in Tamil Nadu.
Answer:
Tamil Nadu has various hill stations like Ooty, Kodaikanal, Kolli hills,Kothagiri and Yercaud.

Question 3.
Describe the plateaus.
Answer:
There are three plateaus in Tamil Nadu namely Bharamahal plateau, Coimbatore plateau and Madurai plateau. There are many small hills between these plateaus. Chennimalai is one among these hills in Erode.

Question 4.
What is river plains?
Answer:
Rivers Palar, Cheyyar, Pennar and Vellar form the Northern plains. The middle river plain is formed by Kaveri and its tributaries River Vaigai and Thamirabarani form the Southern plains.

Question 5.
Name the beaches in Tamil Nadu.
Answer:
(a) Marina Beach, the second longest urban beach in the world.
(b) Rameswaram beach is famous for its beautiful view.
(c) Kanniyakumari beach is famous for its beautiful views of sunrise and sunset over the water.

Question 6.
What are the types of forests?
Answer:
The forests can be divided into three types. They are
(a) Evergreen forests
(b) Deciduous forests
(c) Swamp forests

Question 7.
What is Mangrove forests?
Answer:
The word swamp means areas that are low where water gets collected easily. These forests are usually found near the beaches and river beds. The Pichavaram mangrove forest is located near Chidambaram in Tamil Nadu.

Question 8.
What is the other name for Suruli waterfalls?
Answer:
Megamalai falls

Tamilnadu State Board New Syllabus Samacheer Kalvi 4th Science Guide Pdf Term 3 Chapter 2 Life of Animals Text Book Back Questions and Answers, Notes.

Tamilnadu Samacheer Kalvi 4th Science Solutions Term 3 Chapter 2 Life of Animals

Samacheer Kalvi 4th Science Guide Life of Animals Text Book Back Questions and Answers

I. WHO AM I?

Question 1.
My group is called colony __________
Answer:
Ant

Question 2.
Our home is nest ____________
Answer:
Birds

Question 3.
My feet are broad to help me walk in the sand __________
Answer:
Camel

Question 4.
I use sound navigation to find the objects in my path ___________
Answer:
Bats

Question 5.
I am active during day time as well as night time ___________
Answer:
Lion

II. Fill In the blanks :

Question 1.
The animals which are active at night are called ___________
Answer:
Nocturnal animals

Question 2.
____________ is best known for parental care.
Answer:
Kangaroo

Question 3.
The group of owls are called __________
Answer:
Parliament

Question 4.
___________ lives in hives.
Answer:
Bees

Question 5.
___________ bites us and sucks our blood.
Answer:
Vampire bats

III. Match the following :

Question 1.

Answer:

IV. Answer the following questions In brief :

Question 1.
Why do birds build nests?
Answer:
Birds build nests for their young ones.

Question 2.
What is meant by structural adaptation?
Answer:
Changes in the physical features of the animal are called structural ‘ adaptations.
Example: Polar bears living in cold climate have physical adaptations, such as thick fur and short ears to reduce heat loss.

Question 3.
Define echolocation.
Answer:
Bats produce ultrasonic sound which helps the bats find their way at night and find out the objects on their path. This is called “Echolocation”.

Question 4.
How do ants feel the vibration?
Answer:
Ants feel the vibrations in the ground through their feet.

Question 5.
List out any three animals that live in groups.
Answer:

1. Lion
2. Elephants
3. Wild beast

Question 6.
Why do birds fly in ‘V’ shape?
Answer:
Birds fly in “V” shape to reduce wind resistance.

V. Give short answers :

Question 1.
Why do animals live in groups?
Answer:
Animals live in groups for

• Procuring food
• Taking care of young ones
• Protection from predators.
• Division of labour
• Energy conservation
• Finding mate easily

Question 2.
Explain the three main body regions of insect.
Answer:
Insects have three main body regions. They are; Head, thorax, and the abdomen. All parts of the insect are inside an exoskeleton.

1. Head: The main visible parts on the head are the large compound eyes, the antennae (feelers) and the mouth parts.
2. Thorax; It is the middle region of the body. It bears three pairs of legs and two pairs of wings.
3. Abdomen It is the last part of the insect body. Abdomen of most of the insects have clear segmentation.

Question 3.
What are nocturnal animals?
Answer:

• Some animals sleep in the day time and are very active at night. Such animals are called nocturnal animals.
  Example: Owl.

Samacheer Kalvi 4th Science Guide Life of Animals In Text Questions and Answers

Activity (Text Book Page No. 77)

Question 1.
Match the animals to their group behaviour

Answer:

Activity (Text Book Page No. 80)

Question 1.
Observe any animal in your surrounding and write a creative short story about it.
Answer:
I have a little dog named Tommy. He is a faithful dog to our family. He used to take care of me and my family. Mother always trust Tommy because he never allow anyone to touch me. Tommy is a really happy dog and loves going for walks and runs on the beach.

One unlucky day, he was hit by a car. One of his leg was severely injured. The doctors could not heal the injury. But the physical handicap does not make anyone useless, still he used to take care of me and my family with love.

Activity (Text Book Page No. 82)

Question 1.
Who am I ?
Answer:

Activity (Text Book Page No. 83)

Question 1.
Fill in the missing words.
Answer:
Butterfly has three body parts like all other insects the head, the thorax (chest), and the abdomen (bottom). The butterfly has four wings and six legs are attached to the thorax. Butterfly use its two antenna to smell.

Activity (Text Book Page No. 84)

Question 1.
Place a few sugar cubes in a plate. After sometime, you can see some ants visiting the plate.
Answer:
Because ants have sense of sight, smell, taste & touch.

Activity (Text Book Page No. 85)

Question 1.
Word search puzzle – Nocturnal Animals

Answer:

Activity (Text Book Page No. 86)

Question 1.
Animal Observations

Name of the animal	What is the adult doing?	What is the young one doing?

Answer:

Samacheer Kalvi 4th Science Guide Life of Animals Additional Questions and Answers

I. Choose the correct answers :
Question 1.
___________ have sensitive skin wich can feel even small vibrations in the water.
Answer:
(a) Dolphins
(b) Fish
(c) Alligator
Answer:
(c) Alligator

Question 2.
__________ hold hands while they are sleeping so that they don’t draft apart.
(a) sea horse
(b) sea otters
(c) sea monsters
Answer:
(b) sea otters

Question 3.
Giraffes have developed very long necks because of their _____________.
(a) environmental demands
(b) caring nature
(c) to protect from predators
Answer:
(a) environmental demands

Question 4.
The compound eyes of ___________ are made up of small units called ommatidia.
(a) birds
(b) insects
(c) fishes
Answer:
(b) insects

Question 5.
____________ have thorns on their body to fight against their enemies.
(a) Tiger
(b) Deer
(c) Porcupines
Answer:
(c) Porcupines

II. Fill in the blanks :

Question 1.
Tigers and Zebras have lines so they can __________ themselves (admire / hide)
Answer:
Hide

Question 2.
___________ behaviour includes the activities of an animal and its interactions with other organisms. (Wild / animal)
Answer:
Animal

Question 3.
__________ dont build individual nests. (Social weavers / birds)
Answer:
Social weavers

Question 4.
Animals that are active during day time are known as _____________ animals. (diurnal animals / nocturnal animals)
Answer:
Diurnal animals

Question 5.
____________ increases the survival rate and improves the quality of young one. (parental care / education)
Answer:
Parental care

III. True or False :

Question 1.
Animals like elephants, squirrels do dream during sleep.
Answer:
True

Question 2.
All birds are the same in all activities
Answer:
False

Question 3.
Birds fly in V shape to reduce wind resistance.
Answer:
True

Question 4.
Adaptation is the best essential factor of all living beings
Answer:
False

Question 5.
Dog shivers to generate more heat.
Answer:
True

IV. Match the following :

Question 1.

Answer:

1. – c
2. – a
3. – d
4. – b

V. Answer the following :

Question 1.
Do all birds build nest?
Answer:
Not all the bird species build nests. Some of them lay their eggs on the ground or in gap between rocks.

Question 2.
Though green heron cannot swim, it stills cats fish from the water. How?
Answer:
It drops colourful leaves and fruits into the water. When the fishes pop out to investigate, the heron catches them.

Question 3.
What is group behavior?
Answer:

• Group behaviour is also called social behaviour.
• Members of the group work together to find food, defend themselves and look after the young ones.

Question 4.
Name the 3 main body segments of an insect.
Answer:
Insects have three main body regions. They are; Head, thorax and the abdomen.

Question 5.
What does the thorax contain?
Answer:
The thorax is the middle region of the body. It bears three pairs of legs and two pairs of wings.

Question 6.
How do vampire bats detect their prey?
Answer:
Vampire bats have heat-detecting noses which allow them to find their prey.

VI. Answer in detail :

Question 1.
Explain the three types of adaptations in animals.
Answer:
Three types of adaptations seen in animals. They are:

• Structural adaptations:
  Changes in the physical features of the animal are called structural adaptations.
  Example: Polar bears Jiving in cold climate have physical adaptations, such as thick fur and short ears to reduce heat loss.
• Physiological adaptations:
  Changes in the functions of the animal’s body are called physiological adaptations.
  Example: Dog shivers to generate more heat when it is cold and pants when it is hot.
• Behavioural adaptations:
  Changes in the activities of the animal are behavioural adaptations.
  Example: Birds migrate to avoid adverse conditions.

Question 2.
Do animals have special sense? How does it help them? Give one example.
Answer:
Some animals have special senses and help the animals experience the world around them.
Ants

• Ants have sense of sight, smell, taste and touch.
• Ants have organs of smell and taste in their antennae.
• They feel the vibrations in the ground through their feet.
• Ants have a good sense of smell.

Question 3.
Write about bats
Answer:

• Bats have a good sense of hearing.
• They produce ultrasonic sound which helps the bats find their way at night and find out the objects on their path. This is called “Echolocation”.
• Vampire bats feed on the blood of their prey.
• Vampire bats have heat-detecting noses which allow them to find their prey.

Tamilnadu State Board New Syllabus Samacheer Kalvi 4th Social Science Guide Pdf Term 3 Chapter 3 Rights and duties of children Text Book Back Questions and Answers, Notes.

Tamilnadu Samacheer Kalvi 4th Social Science Solutions Term 3 Chapter 3 Rights and duties of children

Samacheer Kalvi 4th Social Science Guide Rights and duties of children Text Book Back Questions and Answers

I. Choose the correct answer :

Question 1.
This is against Indian law __________.
(a) Children studying in school.
(b) Children below 14 years working in industries.
(c) Children participating in school activities.
(d) Children getting nutritious food.
Answer:
(b) Children below 14 years working in industries.

Question 2.
Polio drops are given to ____________
(a) Men
(b) Women
(c) Children
(d) Senior citizens
Answer:
(c) Children

Question 3.
A set of rules of a country is known as the _____________ .
(a) Story book
(b) Rule book
(c) Constitution
(d) Textbook
Answer:
(c) Constitution

Question 4.
Which of the following is not a right of children?
(a) Getting driving license
(b) Getting education
(c) Getting adequate food
(d) Living in a healthy manner
Answer:
(a) Getting driving license

II. Write True or False :

Question 1.
The child has the basic right to get polio drops.
Answer:
True

Question 2.
There are same rights for all age groups of children.
Answer:
False

Question 3.
All children of age 6-14 years should be employed.
Answer:
False

Question 4.
Hitting children is wrong.
Answer:
True

Question 5.
Children should be aware of bad touch.
Answer:
True

II. Match the Following :

Question 1.

Answer:

IV. Answer the following questions :

Question:1.
What are the three parts on your body where no one should touch?
Answer:
Lips, chest and between my legs.

Question 2.
What are the different rights you have as a child?
Answer:
The four major child rights are:

1. Right to survival ‘
2. Right to development
3. Right to protection
4. Right to participation

Question 3.
Write short note on right to survival.
Answer:

• It is to ensure every child has access to minimum standards of food.
• This helps in healthy growth in all children.
• There are different rights for children below the age of 6’and between the age of 6-14 years.
• This is because both the age groups have different needs for their

Question 4.
Have you ever used your right to participate? Describe.
Answer:
Children have the right to participate in matters related to them. This includes asking questions, giving suggestions and making decisions in things that affect them.

Question 5.
Why are rights important?
Answer:
1. Human rights also guarantee people the means necessary to satisfy their basic needs such as food, housing and education, so they can take full advantage of all opporunities.

2. Finally, by guaranteeing life, liberty, equality and security. Human rights protects people against abuse by those who are more powerful.

Samacheer Kalvi 4th Social Science Guide Rights and duties of children

Text Book Back Additional Questions and Answers

I. Choose the correct answer:

Question 1.
___________ is to ensure every child has access to minimum standards of food.
(a) Right to survival
(b) Right to development
(c) Right to protection
(d) Right to participation
Answer:
(a) Right to survival

Question 2.
There are many diseases that spread through ____________ .
(a) air
(b) Land
(c) Water
(d) None
Answer:
(c) Water

Question 3.
All children ___________ years have the right to go to school.
(a) Below 14
(b) After 14
(c) Below 16
(d) After 15
Answer:
(a) Below 14

Question 4.
Children have the ___________ in all circumstances.
(a) Right to participation
(b) Right to development
(c) Right to be protected
(d) Right to survival
Answer:
(c) Right to be protected

II. Fill in the blanks:

Question 1.
__________ is the lengthiest constitution of the world.
Answer:
The Indian constitution

Question 2.
The __________ is responsible to providing free education to all.
Answer:
Government

Question 3.
___________ is illegal to force children below the age of 14 to work.
Answer:
Child labour

III. Write True or False :

Question 1.
Right to survival helps in healthy growth in all children.
Answer:
True

Question 2.
Every child has the right to go to school and develop life skills.
Answer:
True

Question 3.
Children have does not any rights.
Answer:
False

Question 4.
Children have the right to be protected against danger.
Answer:
True

IV. Match the following :

Question 1.

Answer:

1. – e
2. – d
3. – a
4. – b
5. – c

V. Answer the following questions :

Question 1.
What do you mean by citizen?
Answer:

• Citizen is a person who is a member of a country.
• A citizen enjoys the rights given to him/her by the country.

Question 2.
Who sets rules for citizens?
Answer:
The constitution of India sets rules.

Question 3.
Does constitution make citizens responsible?
Answer:
Yes, it helps all people to be a responsible citizen of our country.

Question 4.
What else is a part of rights to survival?
Answer:
The WASH programme is also a part of rights to survival.

Question 5.
What do you mean by WASH?

Answer:

• WASH stands for Water, Sanitation and Hygiene.
• It means there should be access to clean water for drinking and other needs.
• There are many diseases that spread through water.
• To avoid these, having access to safe water is very important.

Question 6.
Write a short note on Right to Development.
Answer:
Every child has the right to go to school and develop life skills.

Question 7.
What do you mean by child labour?
Answer:
Children are involved in different works at different places. This is called Child Labour.