Question

Which of the following are correct for the greenhouse effect?

(i) CO2 is mainly responsible for the greenhouse effect.

(ii) The gradual increase in the average temperature of the earth’s atmosphere is

called global warming.

(iii) Methane, nitrous oxide and water vapour are greenhouse gases like CO2.

(iv) An increase in earth’s temperature by as little as 0.5

0C has no effect.

(A) (i), (ii), (iii) (B) (ii), (iii), (iv) (C) (i), (iii), (iv) (D) (i), (ii), (iii),(iv)​

Answer 1

Answer:

(A) i ,ii ,iii

Explanation:

• Greenhouse effect is observed in the atmosphere by various gases and agents such as water vapor, carbon dioxide and others.
• They trap the atmospheric heat not allowing them to escape and this causes the increase in the earth's temperature. This phenomenon is called global warming.
• Any slight increase in the temperature might be harmful to our environment because it disturbs the balance and cause the glaciers to melt. Thus even 0.5 degree increase cannot be ignored.

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Answer 2

Answer:

The correct answer is (C) (i), (iii), (iv)

Explanation:

Greenhouse effect is caused by the gases like Carbon dioxide (CO₂), Methane (CH₄), Nitrous oxide (N₂O) and  Fluorinated gases that includes Hydrofluorocarbons, perfluorocarbons, sulfur hexafluoride, and nitrogen trifluoride. They are emitted from a variety of household, commercial, and industrial applications and processes.

All these gases together increase the temperature of the earth that constitutes in the green house effect.

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