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Question

Which of the following members of phylum Coelenterata lack a sexual medusa stage?

A
Jellyfish
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B
Hydra
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C
Sea ginger
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D
Sea raft
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Solution

The correct option is B Hydra
Hydra is a sessile coelenterate that has no sexual medusoid stage and only a polyp stage is found.
Jellyfish, sea ginger (Millepora) and sea raft (Velella) also belong to phylum Coelenterata. They exhibit alternation of generations or metagenesis.

Millepora

Velella

Hydra

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