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Assertion (A): The amount of water vapour in the atmosphere is higher over equatorial regions than over polar regions.

Reason (R): The rate of evaporation is higher in equatorial regions due to higher temperatures and intense solar radiation.

Which one of the following is correct?

  1. Both A and R are true, and R is the correct explanation of A.
  2. Both A and R are true, but R is NOT the correct explanation of A.
  3. A is true, but R is false.
  4. A is false, but R is true.

Answer (Detailed Solution Below)

Option 1 : Both A and R are true, and R is the correct explanation of A.

Detailed Solution

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The correct answer is option 1.

Key Points

  • Assertion (A) – Correct – Water vapour concentration is highest near the equator because of intense heating and continuous evaporation from oceans and tropical forests.
  • Reason (R) – Correct – The equator receives the most solar radiation, leading to higher evaporation rates, which increases atmospheric moisture.
  • R correctly explains A because higher evaporation in the equatorial region leads to more water vapour in the atmosphere there.
  • Correct Answer: (a) Both A and R are true, and R is the correct explanation of A.

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