Question

Even in the absence of a skeleton, the anterior end of the earthworm becomes turgid and acts as a hydraulic skeleton. It is due to

• A. Coelomic fluid
• B. Setae
• C. Gut peristalsis
• D. Septum

Answer 1

The correct option is A Coelomic fluid

Hydrostatic skeletons are common among simple invertebrate organisms. A hydrostatic skeleton is a flexible skeleton supported by fluid pressure.
The fluid within the coelom is called coelomic fluid. The coelomic fluid creates the fluid pressure in the absence of skeleton. The anterior end of the earthworm becomes turgid due to this and acts as a hydraulic skeleton.