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Q.

Which of the following animals exhibits metagenesis?

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a

Hydra

b

Obelia

c

Adamsia

d

Planaria

answer is B.

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Detailed Solution

The cnidarians which exist in both forms exhibit alternation of generation (metagenesis), i.e., polyps produce medusae asexually and medusae form the polyps sexually (e.g., Obelia). Medusa stage is absent in Hydra.

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