Air Around us
Chapter 11
1. What is the composition of air?
Ans:
2. Which gas in the atmosphere is essential for respiration?
Ans:
3. How will you prove that air supports burning?
Ans:
4. How will you show that air is dissolved in water?
Ans:
5. Why does a lump of cotton wool shrink in water?
Ans:
6. The layer of air around the earth is known as ___________.
7. The component of air used by green plants to make their food, is ___________.
8. List five activities that are possible due to the presence of air.
Ans:
9. How do plants and animals help each other in the exchange of gases in the
atmosphere?
Ans: