Question

In Pheretima locomotion occurs with help of
a. circular muscles
b. longitudinal muscles and setae
c. circular, longitudinal muscles and setae
d. parapodia

Answer 1

'C' is the right answer

Answer 2

Answer: The correct answer is C) Circular, longitudinal muscles and setae.

Pheretima belongs to a phylum of invertebrates called Annelida. It has segmented body and each segment has tiny hairy bristles also called setae, which help in gripping the soil while the organism is moving.

It uses two different muscles for locomotion that is Circular and longitudinal muscles. The contraction of circular muscles causes the body to stretch, thus making it longer and thinner.

Whereas, contraction of longitudinal muscles causes the body shorter and wider, thus pulling it forward.

Thus, option C) is the right answer.