The main function of nematocyst in Hydra is

Catching the prey

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Paralysing the prey

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Eating of prey

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None of the above

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Solution

The correct option is B Paralysing the prey
In Hydra, a cnidarian, the cnidocytes contain specialized structures called nematocysts, which contain poison. Nenatocyst is a coiled hollow thread which is triggered by cnidocil. Upon contact with prey, the contents of the nematocyst are explosively discharged, which can paralyze the prey for defense.
Therefore, the correct answer is option B.

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