NEET BIOLOGY

Detailed explanation-1: -Summary. Dinoflagellates possess two flagella; usually these are directed perpendicular to one another constituting a transversal flagellum and a longitudinal, trailing flagellum, respectively. The transversal flagellum causes the cell to rotate around its length axis.

Detailed explanation-2: -Dinoflagellates are alveolates possessing two flagella, the ancestral condition of bikonts. About 1, 555 species of free-living marine dinoflagellates are currently described.

Detailed explanation-3: -They are motile. Dinoflagellates swim by means of two flagella, movable protein and microtubule strands that propel the cell through the water. The longitudinal flagellum extends out from the sulcal groove of the hypotheca (posterior part of cell); when it whips back and forth it propels the cell forward.

Detailed explanation-4: -The transverse flagellum works as a propelling device that provides the main driving force or thrust to move the cell along the longitudinal axis of its helical swimming path.