The largest nematocysts of Hydra are

Volvents

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Penetrants

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Atrichous isorhizas

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Holotrichous isorhizas

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Solution

The correct option is B Penetrants
Hydra consists of three types of nematocysts. namely penitrant, volvent and glutinant which have different sizes and different structures. The penetrant nematocysts are large while the other two are small.
So, the correct answer is 'Penetrants'.

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