Transverse groove present in dinoflagellates is

Sulcus

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Annulus

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Cingulum

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Both B and C

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Solution

The correct option is D Both B and C
Dinoflagellates are unicellular photosynthetic organisms. The cells of dinoflagellate are generally covered by theca or lorica. Theca contains two grooves, the longitudinal groove called sulcus and transverse groove known as cingulum or annulus or girdle.
So, the correct answer is 'Both B and C'

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