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Which one of the following statement regarding coelom of given animals is correct?

A. Round worms (aschelminthes) are pseudocoelomates.

B. Molluscs are acoelomates.

C. Insects are pseudocoelomates.

D. Flatworms (platyhelminthes) are coelomates.

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Correct Answer : A.


Acoelomates are animals that have no body cavity or coelom. The examples are poriferans, coelenterates, ctenophores, platyhelminthes, etc. Pseudocoelomates are animals that have false or pseudocoelom. Examples are aschelminthes. Coelomates are animals that have true coelom enclosed by mesoderm on both sides. Examples: annelida to arthropoda. Hence, roundworms are pseudocoelomates, molluscs and insects are coelomates while flatworms are acoelomates. The charactersties features given above describe tenophora.

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