An unarmoured dinoflagellate is

Ceratium

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Noctiluca

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Gonyaulax

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Both B and C

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Solution

The correct option is B Noctiluca
Noctiluca is a non-parasitic non-motile dinoflagellate, which emits bioluminescence when gets disturbed.
It lacks armour plating. Ceratium (having pellicle plates) and Gonyaulax (having resting cysts) are well equipped and armoured.
The correct answer is B.

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