Question

what is ment by hydra

Answer 1

any freshwater polyp of the genus Hydra and related genera, having a cylindrical body with a ring of tentacles surrounding the mouth, and usually living attached to rocks, plants, etc., but also capable of detaching and floating in the water.

Answer 2

Hi
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Hydra is in Phylum Coelenterata cnidaria (Blind sac body plan )
these are radially symmetrical
body wall is diploblastic
the only home no space inside the body is known as gastrovascular cavity its opening service both as mouth and anus
the there are specialised stinging cells called nematoblasts
Hydra is the only fresh water cnidarian

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Hope it will help you
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