With reference to “water vapour”, which of the following statements is/are correct? It is a gas, the amount of which decreases with altitude.

With reference to “water vapour”, which of the following statements is/are correct?

1. It is a gas, the amount of which decreases with altitude.
2. Its percentage is maximum at the poles.

Select the answer using the code given below:

(a) 1 only

(b) 2 only

(c) Both 1 and 2

(d) Neither 1 nor 2

Correct Answer: (a) 1 only

Explanation:

• Statement 1 is correct because water vapour is a gas and its concentration decreases with altitude.
• Statement 2 is incorrect because the percentage of water vapour is not maximum at the poles; it is generally higher in tropical and equatorial regions.
  Possible Sources: Meteorology and atmospheric science textbooks.