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

Jellyfish

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Hydra

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Sea ginger

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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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