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Among the gases (a) – (e), the gases that cause greenhouse effect are: (a) CO2 (b) H2O (c) CFCs (d) O2 (e) O3

1. (a), (b), (c) and (d)
2. (a), (b), (c) and (e)
3. (a) and (d)
4. (a), (c), (d) and (e)

Correct answer: (a), (b), (c) and (e)

Solution

Carbon dioxide (CO2), water vapor (H2O), chlorofluorocarbons (CFCs), and ozone (O3) are all known to trap heat in the atmosphere, contributing to the greenhouse effect, while oxygen (O2) does not have this property.

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