Cross section of animal body is given below.

Which one of the following animals will satisfy the above cross section?

Hydra

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Sycon

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Planaria

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Euspongia

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Solution

The correct option is C Planaria

Those animals in which the developing embryo has a third germinal layer, mesoderm, in between the ectoderm and endoderm, are called triploblastic animals (platyhelminthes to chordates).

Hydra - Coelenterata (Cnidaria)
Sycon - Porifera
Planaria - Platyhelminthes
Euspongia - Porifera

Planaria is a widely distributed, mostly free-living flatworm belonging to phylum platyhelminthes.

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