Q. Earthworms have no skeleton but during burrowing, the anterior end becomes turgid and acts as a hydraulic skeleton. It is due to
A) Setae
B) Coelomic fluid
C) Blood
D) Gut peristalsis
Explanation
[Solution from source] The fluid-filled coelomic compartments of the earthworm, squeezed by body-wall muscles, make the anterior end turgid and act as a hydrostatic skeleton. Setae only grip the soil during locomotion and do not provide the turgidity. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.