Question

Greenhouse effect is due to the presence of

• A. Ozone layer in the atmosphere
• B. Infrared light reaching the earth
• C. CO${}_2$ layer in the atmosphere
• D. Moisture layer in the atmosphere

Answer 1

Answer: (C)

The gases which are transparent to solar radiation but retain and partially reflect back long-wave heat radiations are called greenhouse gases. Greenhouse gases are essential for keeping the earth warm and hospitable. The various greenhouse gases are carbon dioxide (warming effect 60%), methane (warming effect 20%), chlorofluorocarbons or CFCs (warming effect 14 percent) and nitrous oxide (warming effect 6 percent). Other gases of minor importance are water vapour and ozone.

So, the correct answer is option D.