Which soil horizon contains the maximum biological activity? MCQ with Answer and Explanation

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Which soil horizon contains the maximum biological activity?

A. A Horizon

B. C Horizon

C. R Horizon

D. B Horizon

Answer: Option A

Solution (By JKSSB Mock Tests)

The A Horizon or topsoil contains humus and supports maximum microbial and biological activity.

This question belongs to: Geography GK Soils of India

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Question #1

Which soil is formed by decomposition of forest organic matter in hills?

A. Black soil

B. Laterite soil

C. Desert soil

D. Mountain soil

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Correct Answer: Option D

Explanation:
Mountain soil is formed in forested hilly areas with organic matter accumulation.

This question belongs to: Geography GK Soils of India

Question #2

Which process enriches the upper soil layer with organic matter?

A. Leaching

B. Salinization

C. Humification

D. Erosion

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Correct Answer: Option C

Explanation:
Humification is the conversion of organic matter into humus.

This question belongs to: Geography GK Soils of India

Question #3

Which process is responsible for the formation of soil from parent rock?

A. Weathering

B. Photosynthesis

C. Respiration

D. Pollination

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Correct Answer: Option A

Explanation:
Weathering breaks down rocks into smaller particles that eventually form soil.

This question belongs to: Geography GK Soils of India

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