Instruction: Identify the assumptions that must be true for the given statement to be valid, and choose the correct option.
Statement: The Himalayas serve as a natural barrier that blocks the monsoon winds from reaching certain regions, resulting in the formation of dry zones on the leeward side.
Assumptions:
I. The Himalayas obstruct the movement of monsoon winds to specific areas.
II. The leeward side of mountains receives less rainfall due to the rain shadow effect.
III. Monsoon winds are the only factor responsible for rainfall in the northern plains.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. Only I and II are implicit.
The statement implies that the Himalayas block monsoon winds (I) and that this leads to dryness in the leeward areas (II).
Assumption III is not essential, as other factors can also influence rainfall.