Question

How does locomotion take place in leech?

Answer 1

Locomotion in leech takes place by:
(i) looping or crawling movement
(ii) Swimming movement.

(i) Looping or Crawling movement:
This type of movement is brought about by the contraction and relaxation of muscles. The two suckers serve for attachment during movement on a substratum.
(ii) Swimming movement:
Leeches swim very actively and perform undulating movements in water.