Question

Setae helps an earthworm to undergo movement. What are the two types of movement seen in an earthworm during the repeated contraction and relaxation of the body ?​

Answer 1

Answer:

A wave of contraction of longitudinal muscles follows, and the cycle is repeated. The setae of a segment are extended by certain body muscles to prevent backward movement of the segment during the contraction of the longitudinal muscles. The setae are retracted during the circular contraction period.