The sulcus or longitudinal groove of dinophycean shell contains

Narrow smooth flagellum

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Thick ribbon-shaped flagellum

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Tail

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Mucilage canal

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Solution

The correct option is A Narrow smooth flagellum
The cell surface of dinophyceae bears two furrows, each holding one thread like smooth flagellum. The transverse furrow is called the 'cingulum' and the longitudinal one called the 'sulcus'.
So the correct answer is option A.

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