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AIIMS 201926 May
Exam
AIIMS
Year
2019
Date
26 May
Subject
Botany
Chapter
Environmental Issues

AIIMS 2019 · 26 May · Botany · Environmental Issues

Which gases are responsible for increasing the temperature of...

Which gases are responsible for increasing the temperature of atmosphere?

Options

  1. ACO,NO2,H2 S\mathrm{CO}, \mathrm{NO}_2, \mathrm{H}_2 \mathrm{~S}
  2. BCH4,CO2, N2O\mathrm{CH}_4, \mathrm{CO}_2, \mathrm{~N}_2 \mathrm{O}
  3. CCH4,CO2, N2O\mathrm{CH}_4, \mathrm{CO}_2, \mathrm{~N}_2 \mathrm{O}
  4. DNO2,H2 S,CO2\mathrm{NO}_2, \mathrm{H}_2 \mathrm{~S}, \mathrm{CO}_2

Correct answer

C. CH4,CO2, N2O\mathrm{CH}_4, \mathrm{CO}_2, \mathrm{~N}_2 \mathrm{O}

Step-by-step solution

The gases which are transparent to solar radiation but retain and partially reflect back long wave heat radiations are called greenhouse gases (GHGs). The phenomenon is called greenhouse flux. Because of greenhouse flux, the mean annual temperature of earth is 15∘C15^{\circ} \mathrm{C}. In its absence it will fall to −18∘C-18^{\circ} \mathrm{C}. Hence, greenhouse gases keep the earth warm and hospitable. The various greenhouse gases are CO2\mathrm{CO}_2 (warming effect 60%60 \% ), CH4\mathrm{CH}_4 (effect 20%20 \% ), chlorofluorocarbons or CFCs (14\%) and nitrous oxide \left(\mathrm{N}_2 \mathrm{O}, 6 \%\right)$. Others of minor significance are water vapours and ozone.
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