(B) $Pheretima$ $posthuma$ (earthworm) is known as the 'friend of farmers'.They make the soil porous by burrowing,which helps in the penetration of ai

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They make the soil porous,leave their castings,and take organic debris into the soil.

(B) $Pheretima$ $posthuma$ (earthworm) is known as the 'friend of farmers'.They make the soil porous by burrowing,which helps in the penetration of air and water into the soil.They also consume organic debris and excrete nitrogen-rich castings,which act as natural fertilizers,thereby increasing soil fertility.

Class 11 Biology Structural Organisation In Animals Anatomy of Earthworm

Medium

$Pheretima$ $posthuma$ is highly useful as:

AIPMT 1990 All AIPMT

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