Animal Kingdom Question 89
89. Pheretima posthuma is highly useful as
[1990]
(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
Show Answer
Answer : b
Hints & Solutions
(b) Earthworms are very useful to human as they make the soil porous and increase its fertility through worm casting. They are called as Nature’s ‘plough man’.
