Assertion (A): Carbon dioxide is one of the important greenhouse gases.
Reason (R): It is largely produced by respiratory function of
animals and plants.
(i) Both A and R are correct and R is the correct explanation of A.
(ii) Both A and R are correct but R is not the correct explanation of A.
(iii) Both A and R are not correct.
(iv) A is not correct but R is correct
(i) Both A and R are correct and R is the correct explanation of A.
Explanation:Carbon dioxide is one of the main components and important greenhouses gases. Gases like methane, carbon dioxide and nitrous oxide absorb the UV radiations and prevent them from escaping from the Earth’s atmosphere, thus leading in the increaseof the temperature of the Earth’s surface which is essential for the sustenance of life. All living organism exhale carbon dioxide during the respiration process which in turn leads to the accumulation of 
in the atmosphere. On the other hand, increasing concentration of carbon dioxide leads to global warming as well. Therefore, the proportion of 
in the atmosphere should be maintained.