37. The 'Green House effect' is produced due to the presence of excess amount of :

(A) Sulphur dioxide
(B) Nitrogen dioxide
(C) Carbon monoxide
(D) Methane

Ans. (D) Methane


By their percentage contribution to the greenhouse effect on Earth the four major gases are:

water vapor              36–70%
carbon dioxide           9–26%
methane                       4–9%
ozone                           3–7%