Question

Match the following and choose the correct combination from the option given below.

	Column I (Green house gases)		Column II (Concentration in 2000 AD)
A	$C{O}_2$	1	282 ppt
B	$C{H}_4$	2	316 ppb
C	$N_{2}O$	3	368 ppm
D	$CFC+HFC$	4	1750 ppb

• A. A- (3), B- (4), C- (2), D- (1)
• B. A- (4), B- (3), C- (2), D- (1)
• C. A- (2), B- (3), C- (4), D- (1)
• D. A- (1), B- (4), C- (2), D- (3)
• E. A- (1), B- (2), C- (3), D- (4)

Answer 1

The correct option is A A- (3), B- (4), C- (2), D- (1)

The green house effect is the warming effect found in green house by allowing solar radiation to pass in but preventing long wave heat radiation to pass put due to glass panes, water vapours and carbon dioxide. In atmosphere, the gases which are transparent to solar radiations but retain and partially reflect back long wave heat radiations are called as green house gases. The various greenhouse gases are carbon dioxide, methane, chlorofluorocarbons and nitrous oxide. There has been a steady increase in concentration of greenhouse gases in the atmosphere. The concentration in 2000 AD of carbon dioxide was 368 ppm, methane 1750 ppm, nitrous oxide 316 ppb, and chlorofluorocarbons and hydrofluorocarbons 282 ppt.

Therefore, the correct answer is option A.