Humus in soil is necessary for plant growth because it

Increases aeration and water absorption capacity of soil

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Makes soil compact

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Makes soil sterile

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Decreases rate of percolation

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Solution

The correct option is A Increases aeration and water absorption capacity of soil
In soil humus is derived from partial degradation of organic matter in soil. Humus refers to the fraction of soil organic matter, that is amorphous and without the cellular structure characteristic of plants, micro-organisms or animals.
Humus significantly influences the bulk density of soil and contributes to moisture and nutrient retention. Soil formation begins with the weathering of humus.

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