Question

A. Write 'True' or False' for the following statements.

1. The mesosphere in the atmosphere contains most of the air.

2. The air pressure and density decrease with decreasing altitude.

3.Stratosphere contains ozone layer which protects the earth from U.V, radiations.

4. Carbon dioxide is the main component of air in terms of percentage by volume.

5. Carbon dioxide gas turns lime water blue.

6. Respiration process releases energy

7. Aquatic animals use dissolved air in water for respiration.

8. Greenhouse effect is being caused due to excess of nitrogen in air.

9. Plants prepare their food by photosynthesis.

10. Wind mills are used to generate electricity.

11. Water vapour in air determines the climatic conditions.

12. Nitrogen is converted to soluble nitrogenous compounds in the soil by greenhouse effect.

13.Air helps in the pollination process.

14. Nodules of leguminous plants contain symbiotic bacteria.

15. Nitrogen maintains the temperature on earth and acts as a fire extinguisher.

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Answer 1

1. False
2. False
3. true
4. False
5. false
6. true
7. true
8. false
9. true
10. true
11. true
12. false
13. true
14. True
15. true