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Question

Greenhouse effect is mainly due to increase in the levels of:
  1. O2
  2. CO
  3. CO2
  4. N2

A
CO
B
CO2
C
O2
D
N2
Solution
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A layer of carbon dioxide (CO2) present in the atmosphere prevents the solar radiations (reflected by the earth's surface) from going out in the atmosphere. This heats up the earth's surface and results in the greenhouse effect.

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