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GS Geography Physical Geography of World
Q.

 _________ affect the rate of humus formation of soil.
Explanation:

ANS. (A) 
Flora and Fauna play a critical role in the rate of humus formation of soil. When plants die, leaves are dropped onto the soil surface where microorganisms can “attack” and decay plant tissue. These organisms utilize easily digestible materials (like simple sugars and carbohydrates) found in the plant material, leaving fats and waxes behind. The material left behind is not easily decomposed; it comprises the humus found in soil.

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