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

46. निम्नलिखित कथनों पर विचार कीजिए:
कथन I:
वायुमंडल में विद्यमान धूल कणों की मात्रा, विषुवतीय और ध्रुवीय क्षेत्रों की अपेक्षा, उपोष्ण और शीतोष्ण क्षेत्रों में अधिक है।

कथन II :
उपोष्ण और शीतोष्ण क्षेत्रों में कम शुष्क पवन चलती है।

उपर्युक्त कथनों के संदर्भ में, निम्नलिखित में से कौन-सा एक सही है?
(a) कथन I और कथन II दोनों सही हैं तथा कथन II, कथन I की व्याख्या करता है
(b) कथन I और कथन II दोनों सही है किन्तु कथन II, कथन I की व्याख्या नहीं करता है
(c) कथन I सही है किन्तु कथन II सही नहीं है
(d) कथन I सही नहीं है किन्तु कथन II सही है

Answer: C

Explanation:

Dust particles are generally concentrated in the lower layers of the atmosphere; yet, convectional air currents may transport them to great heights.

Statement I is correct and statement II is not correct: The higher concentration of dust particles is found in subtropical and temperate regions due to dry winds in comparison to equatorial and polar regions. Dust and salt particles act as hygroscopic nuclei around which water vapour condenses to produce clouds.

This is because dry winds in these regions can lift and transport dust particles more effectively than the wetter, more stable atmospheric conditions found in equatorial and polar areas.