Q39 / 200 · NEET 2011 (Screening) · Botany

Which one of the following pairs of gases are the major cause of 'Green house effect'?

  • A
    $\mathrm{CO}_2$ and $\mathrm{CO}$
  • B
    $\mathrm{CFCs}$ and $\mathrm{SO}_2$
  • Correct answer
    C
    $\mathrm{CO}_2$ and $\mathrm{N}_2 \mathrm{O}$
  • D
    $\mathrm{CO}_2$ and $\mathrm{O}_3$

Solution

The phenomenon of keeping the earth warm due to presence of certain radiatively gases in the atmosphere is called green house effect (Fourier, 1827). The name is based after a similar warmer interior in a glass-enclosed green house where glass panes, $\mathrm{CO}_2$ and water vapour allow the solar radiations to enter but prevent the escape of long wave heat radiations. $\mathrm{CO}_2$ and $\mathrm{N}_2 \mathrm{O}$ are the major cause of "green house effect". $\mathrm{CO}_2$ contributes $60 \%$ of total global warming. $\mathrm{N}_2 \mathrm{O}$ contributes $6 \%$ to green house effect.

Hence, the correct answer is option: 'C'.

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