Question

The true statement about 'Green -house effect' is that it is

• A. Caused by combination of many gases
• B. Caused only by $C{O}_2$
• C. Caused by $C{O}_2,CFC,C{H}_4$ and $N{O}_2$ gases
• D. None of the above
  

Answer 1

Answer: (A)

Caused by combination of many gases

Greenhouse effect is the phenomenon in which radiations from the sun are trapped in the earth's surface and this causes the warming of surface and increase in temperature of earth. Various gases such as carbon dioxide and carbon monoxide trap the heat radiations that enter the earth's surface and promotes greenhouse effect. Such gases are called greenhouse gases. Approximate contribution of different gases to greenhouse effect is as follows:

• Carbon dioxide (CO₂)- 60%
• Methane (CH₄)- 20%
• Chlorofluorocarbons (CFC)- 14%
• Nitrous oxide (N₂O)- 6%

Hence, greenhouse effect is caused by combination of many gases.

So, the correct answer is 'Caused by combination of many gases'.