Earthworms have no skeleton but during burrowing, the anterior end becomes turgid and acts as a hydraulic skeleton. It is due to

Options

(a) Gut peristalsis
(b) Setae
(c) Coelomic fluid
(d) Blood

Correct Answer:

Coelomic fluid

Explanation:

Hydraulic skeleton is the system of support found in soft bodies invertebrates, which relies on the incompressibility of fluids contained within the body cavity. In earthworms the coelomic fluid is under pressure within the coelom and therefore provides support for internal organs. Due to hydraulic skeleton, during burrowing, the anterior end becomes turgid and aids in relaxation of longitudinal muscles.