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Q.

How does earthworms help the soil?

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a

Earthworm increases soil porosity

b

Earthworm increase water holding capacity 

c

Earthworm increases soil aeration

d

All of the above

answer is D.

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Detailed Solution

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Earthworms helps the soil by increasing soil porosity which increases soil aeration, water movement and water holding capacity of soil. 

Earthworm eats other insects which are harmful for plants and produces organic matter which balance nutrient cycle in the soil.

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