First slide

Basis of Classification

Question

Metamerism is exhibited by which of the following phyla?

Easy

A

Platyhelminthes and Annelida
B

Arthropoda and Annelida
C

Arthropoda and Mollusca
D

Mollusca and Aschelminthes

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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