Which of the following factors primarily influences the Indian monsoon? 1. Differential heating of land and sea 2. Presence of high-pressure area over the Indian Ocean 3. Jet streams in the upper troposphere 4. Western disturbances Select the correct answer using the code below: |ForumIAS

[A] 1 and 3 only

[B] 1, 2 and 3 only

[C] 2, 3 and 4 only

[D] 1, 2, 3 and 4

Answer: D

Notes:

Explanation:

Monsoon is primarily driven by the differential heating of land and sea. The subtropical high-pressure area over the Indian Ocean pushes moist winds toward India. Jet streams, particularly the Tropical Easterly Jet and Subtropical Westerly Jet, guide monsoon winds.
Western disturbances, though a winter phenomenon, influence monsoon’s northward movement and impact.

Source: India Physical Environment (Class 11th NCERT)

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