Answer the following questions in brief.
1. Give
two examples to show presence of air
.
2 Write two uses of:
a. Nitrogen b. Windmill
3. What is smoke? How is it produced?
4 Which component of air acts as supporter of burning? Calone
5. State the importance of carbon dioxide for living organisms
6. Define atmosphere and state its composition.
7. What fraction of air is oxygen and nitrogen?
8. Why do all plants require nitrogen?
9 Why is ozone layer very important for the earth's atmosphere?
Answers
Answered by
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What is the composition of air?
Answer: Air is composed of nitrogen, oxygen, carbon dioxide, many other gases, water vapour and dust particles.
Which gas in the atmosphere is essential for respiration?
Answer: Oxygen
The layer of air around the earth is known as ___________.
Answer: Atmosphere
The component of air used by green plants to make their food, is ___________.
Answer: Carbon dioxide
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