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Phylum Annelida

There is no t...

Question

There is no true internal body cavity or coelom in

A

Echinodermata

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B

Vertebrata

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C

Mollusca

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D

Platyhelminthes

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Solution

The correct option is D Platyhelminthes
A coelom is a cavity that is lined by mesothelium which is an epithelium derived from mesoderm.
The organs in them are formed inside a coelom which can freely move, grow, and develop independently of the body wall.
Animals with true coelom are called coelomates.
Acoelomates are those in which no true body cavity is present.
Eg- Porifera, Cnidaria, Ctenophora, and Platyhelminthes.
The correct answer is OPTION D.

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