A) circular muscles
B) longitudinal muscles and setae
C) circular, longitudinal muscles and setae
D) parapodia
Correct Answer: C
Solution :
Locomotion in earthworm involves the circular, longitudinal muscle and setae. According to the study of Gray and Lissman (1938) the body of Pheretima undergoes extension, anchoring and contraction during the course of its progression. A wave of contraction affecting circular muscles begins at the anterior end and travels posteriorly. This is followed by another wave of contraction affecting longitudinal muscles causing thickening and shortening of body. This process is repeated alternately. According to calculation by this method the earthworm travel a distance of about 25 cm in one minute.
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