The given figure shows a cross section of the body of an invertebrate. Identify the animal which has such body plan.

Cockroach (Arthropoda)

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Roundworm (Aschelminthes)

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Planaria (Platyhelminthes)

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Earthworm (Annelida)

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Solution

The correct option is C Planaria (Platyhelminthes)
The animals in which the coelom is absent are called acoelomates, for example flatworms (Planaria). In them the space between ectoderm and endoderm is filled with parenchyma derived from mesoderm. The given figure lacks a coelom.
Hence the correct option is C.

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