Animal KingdomHard
Question
Earthworms have noskeleton but during burrowing, the anterior end becomes turgid and acts as a hydraulic skrlrton. It is due to
Options
A.Coelomic fluid
B.blood
C.gut peristslsis
D.setae
Solution
The body cavity (coelom) of earfworm is filled with an alkaline, colourless or milky coelomic coelomic fluid containing water, salts some proteins and four types of coelomic corpuscles i.e, phagocytes, mucocytes, circular nucleated cells and chloragogen cels. During burrowing the coelomic fluid becomes turgid and acts as hydranlic skelecteton. Earehworn. (Pheretima posthuma) living in body shows metameric segmentation. About the middle of each segmennt there is a ring of tiny curvedbristles called setae or chartae, formed of a horny nitrogenous organic substance known as chitin. The setae and musculature serve for locomotion as well as for anchoring body firmly in burrow. The blood of earthworm is composed of a fluid plasma and colourless corpuscles.physiologically comparable to the leuocytes of vertebrates.
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