In dinophyceae, trichocysts occur in

Peridinium

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Nematodinium

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Caratium

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Gonyaulax.

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Solution

The correct option is A Peridinium
Trichocysts are also called as stinging organelles.
In dinophyceae, trichocysts are present in Peridinium, underlying the cell membrane, which is capable of sudden discharge to prey.
NEmatodinium (has nematocyst) and ceratium (having horns) do not have trichocyst.
The correct answer is A.

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