NCERT Solutions for Class 6 Science Chapter 15 Air Around Us
NCERT Solutions for Class 6 Science Chapter 15 Air Around Us is a beneficial study component required for the students studying CBSE board Class 6 science.
School Connect Online provided NCERT Solution will help students get a comprehensive understanding of the concepts. Studying this chapter will help you in scoring good marks in your class 6 also important for the preparation of Olympiads.
Solution has detailed answers and explanations to the exercise questions provided in the NCERT class 6 science textbook.
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NCERT Solutions for Class 6 Science Chapter 15 Air Around Us
1. What is the composition of air?
Ans :
Air comprises water vapour, Oxygen, Nitrogen, Carbon dioxide, dust and smoke.
2. Which gas in the atmosphere is essential for respiration?
Ans :
Oxygen in the atmosphere is essential for respiration.
3. How will you prove that air supports burning?
Ans:
- Take a candle and place it in a tub.
- Light the candle and fill the tub with water.
- The candle starts growing after some time.
- Now cover the candle with an inverted glass.
- You will find that the candle blows out after burning for some time, and the water level inside the inverted glass rises to some extent.
- The component oxygen of air inside the glass is used up in burning.
- Therefore, water occupies that space.
- This shows that air supports burning.
4. How will you show that air is dissolved in water?
Ans :
- Take some water in a glass vessel or beaker.
- Heat it slowly on a tripod stand.
- Before the water begins to boil, look carefully at the inner surface of the vessel.
- You will see tiny bubbles on the inside.
- On heating, air dissolved in water escapes in the form of these bubbles.
5. Why does a lump of cotton wool shrink in water?
Ans :
The lump of cotton wool shrinks in water because the air inside the cotton lumps are replaced by water which makes the layer stick together.
6. The layer of air around the earth is known as ___________.
Ans :
The layer of air around the earth is known as the atmosphere.
7. The component of air used by green plants to make their food, is ___________.
Ans :
The component of air used by green plants to make their food is carbon dioxide.
8. List five activities that are possible due to the presence of air.
Ans :
The five activities possible due to air are :
i). The wind makes windmills rotate which is used to produce electricity.
ii). Birds, insects and bats fly due to the presence of air.
iii). Air helps in dispersal of seeds and pollen grains of several plants.
iv). Air plays an important role in the water cycle.
9. How do plants and animals help each other in the exchange of gases in the atmosphere?
Ans :
Plants and animals help each other in exchange of gases in the following manner:
i). Plants take in carbon dioxide and give out oxygen which can be utilized by animals for respiration.
ii). Animals take in oxygen and give out carbon dioxide which is utilized by plants to perform photosynthesis.
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