Protists having transverse and longitudinal groove in their theca are

Foraminiferans

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Radiolarians

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Diatoms

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Dinoflagellates

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Solution

The correct option is C Dinoflagellates
Dinoflagellates are unicellular and possess two dissimilar flagella arising from the ventral cell side. The flagella lie in surface grooves: the transverse one in the cingulum and the longitudinal one in the sulcus, although its distal portion projects freely behind the cell.

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