Which one of the following is true for dinoflagellates?
They are mostly heterotrophic.
They have a proteinaceous pellicle.
They form an aggregation called plasmodium.
One of the two flagella lies transversely in a furrow between the cellulosic plates and cell wall.
Dinoflagellates have one flagellum in the transverse groove and the other one in the linear groove between cellulose plates of cell wall.