Question

Pheretima posthuma is highly useful as

• A. Their burrows make the soil loose
• B. They make the soil porous, leave their castings and take organic debris in the soil
• C. They are used as fish meal
• D. They kill the birds due to biomagnification of chlorinated hydrocarbons

Answer 1

The correct option is B They make the soil porous, leave their castings and take organic debris in the soil

Pheretima posthuma or earthworms are very useful to humans as they make the soil porous and increase its fertility through worm casting.