The two gases named as the main greenhouse gases are carbon dioxide and:
AMethane
BOxygen
CNitrogen
DHelium
Answer & Solution
Correct answer: A. Methane
1. These gases absorb infrared heat from the ground.
2. They radiate it back to Earth.
3. The pair is carbon dioxide and methane.
_Source: NCERT Class 12 Biology, Chapter 16, Environmental Issues._
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