Q.

Metamerism is exhibited by which of the following phyla?

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a

Arthropoda and Mollusca

b

Platyhelminthes and Annelida

c

Mollusca and Aschelminthes

d

Arthropoda and Annelida

answer is B.

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Detailed Solution

In arthropods and annelids, the body is externally and internally divided into segments with a serial repetition of at least some organs. They exhibit metamerism. Metamerism is also met with in chordates.

Platyhelminthes, Aschelminthes and Mollusca include unsegmented animals. Tapeworms exhibit pseudometamerism.

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