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Pheretima posthuma is highly useful as

1. their burrows make the soil loose
2. they make the soil porous, leave their castings and take organic debris in the soil
3. they are used as fish meal
4. they kill the birds due to biomagnification of chlorinated hydrocarbons

Correct answer: they make the soil porous, leave their castings and take organic debris in the soil

Solution

Pheretima posthuma is an earthworm that benefits soil by burrowing, which increases porosity and aeration. Its castings enrich the soil, and it helps incorporate organic debris, improving fertility.

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