Q. Consider the following statements:
Statement I:
The amount of dust particles in the atmosphere is more in subtropical and temperate areas than in equatorial and polar regions.
Statement II:
Subtropical and temperate areas have less dry winds.
Which one of the following is correct in respect of the above statements?
(a) Both Statement I and Statement II are correct and Statement II explains Statement I
(b) Both Statement I and Statement II are correct but Statement II does not explain Statement I
(c) Statement I is correct but Statement II is not correct
(d) Statement I is not correct but Statement II is correct
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Answer & Explanation:
✅Correct Answer: (c) Statement I is correct but Statement II is not correct
Explanation:
Statement I – Correct
The concentration of dust particles in the atmosphere is generally higher in subtropical and temperate regions compared to equatorial and polar regions. This is because many subtropical and temperate areas experience dry climatic conditions, sparse vegetation, and stronger surface winds. These factors make it easier for loose soil and sand particles to be lifted into the air. In addition, convectional air currents and wind action can transport dust to higher levels of the atmosphere.
In contrast, equatorial regions receive heavy rainfall and have dense vegetation, which binds the soil and reduces dust suspension. Polar regions, being ice-covered and moisture-rich, also contribute very little dust to the atmosphere.
Statement II – Incorrect
Statement II is incorrect because subtropical and temperate regions actually experience more dry winds, not less. These dry winds play a crucial role in increasing atmospheric dust by lifting and carrying fine particles over long distances. Therefore, the assertion that these regions have less dry winds is factually wrong.
Why Other Options Are Incorrect
- Options (a) and (b) are incorrect because they assume Statement II is correct, which it is not.
- Option (d) is incorrect because Statement I is factually correct.