Question

Earthworms have no skeleton but during
burrowing, the anterior end becomes turgid and
acts as a hydraulic skeleton. It is due to
(a) coelomic fluid (b) blood
(c) gut peristalsis (d) setae

Answer 1

Earthworms have no skeleton but during burrowing, the anterior end becomes turgid and acts as a hydrostatic skeleton due to the coelomic fluid.

* Earthworms have two layers of muscles. There is a fluid filled space between the muscles and digestive tract.

This space is filled with the coelomic fluid.

* The hydrostatic skeleton is also because of this. Animals with soft bodies have  muscular rings filled with fluid that makes their body hydrostatic in nature.

* This type of structure helps in flexible movements in case of such organisms.

Answer 2

The earthworm has no skeleton but during burrowing, the anterior end becomes turgid and acts as a hydraulic skeleton. It is due to "coelomic fluid".

Explanation:

• The earthworm has no skeleton but during burrowing, the anterior end becomes turgid and acts as a hydraulic skeleton. It is due to "coelomic fluid".
• The coelom is filled with alkaline, milky coelomic fluid.
• It is the main body cavity in most animals and contains digestive tract and other organs.
• It is positioned inside the body to surround the tract.

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