Diagrams below are indicating the outline of medusa and polyp forms.Which of the following set of cnidarians exist in both forms and exhibit metagenesis?
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a
Hydra and Obelia
b
Obelia and Physalia
c
Obelia and Adamsia
d
Physalia and Adamsia
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.