Which of the following is a polymorphic coelenterate?

Physalia

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Planaria

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Hydra

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All of the above

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Solution

The correct option is A Physalia
The presence of different type of individuals in a colony to perform specific functions is referred to as polymorphism. Physalia is a disc-like hydrozoid. Its colony consists of gastrozooids, dactylozooids, gonophores and gelatinous zooids. Hydra lack medusa and its polyp is solitary. Planaria is Platyhelminthes and not coelenterate.
Thus, the correct answer is A.

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