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Geography question from JKAS Prelims, 2023 by JKPSC

Consider the following statements:

• Assertion (A): The ground temperature of the forested region is lower than the open ground on the same latitude.
• Reason (R): During the day, trees lose water by evapotranspiration, leading to cool air above the forest.

The correct answer is:

Last updated May 13, 2026
Correct Answer: Option A — A and R both correct and R is correct explanation of A
Breakdown of the Logic
Assertion (A) is correct: Forests act as a natural "insulator." The dense canopy of a forest prevents direct sunlight (insolation) from reaching the forest floor. In contrast, open ground absorbs solar radiation directly, causing the ground temperature to rise significantly higher than the shaded ground of a forest.

Reason (R) is correct: Trees undergo evapotranspiration, a process where they release water vapor into the air through their leaves. This is an endothermic process—it requires heat energy. As the water evaporates, it consumes heat from the surrounding environment, leading to a "latent heat flux" that cools the air and the surface below.

Why (R) explains (A)
The cooling effect mentioned in the Reason is a primary driver of the temperature difference. While the canopy shade (physical barrier) is the most immediate reason the ground stays cool, evapotranspiration is the biological mechanism that actively removes heat from the system, ensuring the forest environment remains significantly cooler than an exposed field at the same latitude.
Answer verified by Quintessence Classes faculty — Karan Nagar, Srinagar.

About this question

JKPSC JKAS 2023 Prelims

Details

Exam JKPSC
Recruitment JKAS
Stage Prelims
Year 2023
Subject Geography
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