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Q.

Planaria is characterised by

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a

absence of mesoderm.

b

sexual dimorphism.

c

true metamerism.

d

absence of body cavity.

answer is D.

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Detailed 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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