Thought air contains only about `0.03%` of carbon dioxide , it is a very important component of air. Give reasons.

Explanation

(i) Carbon dioxide is essential for photosynthesis. In the presence of sunlight green plants use carbon dioxide from air and water vapour from soil to make food by the process of photosynthesis.
(ii) Carbon dioxide extinguishes fire.
(iii) Carbon dioxide is a green house gas.