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Phylum Platyhelminthes

Animals in wh...

Question

Animals in which phylum show triploblasty, bilateral symmetry and cephalisation for the first time?

A

Aschelminthes

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B

Ctenophora

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C

Cnidaria

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D

Platyhelminthes

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Solution

The correct option is D
Platyhelminthes

Animals with triploblastic nature (3 germ layers during early embryogenesis), bilateral symmetry (the body can be divided into identical left and right halves along only one plane), parasitic mode of nutrition and cephalisation (formation of a distinct head) are seen for the first time in phylum platyhelminthes, which is comprised of the flatworms.

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