Which of the following exhibits metagenesis?

Hydra

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Adamsia

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Aurelia

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Obelia

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Solution

The correct option is D Obelia
Life History of Obelia includes both asexual and sexual generations that alternate with each other to complete the life cycle. Such alternation of generation in which the asexual polypoid generation appears to alternate regularly with the sexual medusoid generation but both forms are diploid, is called Metagenesis.
So the correct answer is 'Obelia'.

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Which of the following exhibits metamerism?

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