Q.

Diagrams below are indicating the outline of medusa and polyp forms.

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Which of the following set of cnidarians exist in both forms and exhibit metagenesis?

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a

Physalia and Adamsia

b

Hydra and Obelia

c

Obelia and Adamsia

d

Obelia and Physalia

answer is B.

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Detailed Solution

Obelia and Physalia show metagenesis i.e., they show both polyp and medusa form and alternate the reproduction between sexual and asexual phases.

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