First slide

Classification of Animals

Question

Planaria is characterised by

Easy

A

absence of mesoderm.
B

sexual dimorphism.
C

true metamerism.
D

absence of body cavity.

Solution

Planaria belongs to Platyhelminthes. It is a triploblastic (has three germ layers - ectoderm, mesoderm and endoderm) acoelomate (without body cavity).
It is unsegmented and does not exhibit metamerism
It is hermaphroditic and hence there is no sexual dimorphism.

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