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A genus of small, freshwater cnidarians (coelenterates) which belong to the class Hydrozoa. Hydra is an exceptional member of this class because it is a mobile individual polyp rather than a sessile or colonial form, and uses its cnidoblasts to capture prey. Unlike most Hydrozoa, which spend at least part of their lives in a medusa form, which reproduces sexually, Hydra exists only as polyps. They are typically a few millimeters long.

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8y ago
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9y ago

These are stinging cells found in cnidarian and coelenterate. Each of them bears a stinging cell organelle called nematocyst which is used in offence, defence and attachment of animal.

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Q: What reason are cnidoblasts important to the hydra?
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