Q. Dinoflagellates have
A) Two flagella which lies longitudinally
B) Only one flagellum in the transverse groove between the cell plates
C) Only one flagellum in the longitudinal groove between the cell plates
D) One flagella lies longitudinally and the other transversely in a furrow between the wall plates
Explanation
In dinoflagellates the two flagella are different (heterodont), one transverse flagellum and other longitudinal flagellum. The longitudinal flagellum is narrow, smooth, directed posteriorly and lies in the sulcus. The transverse flagellum is ribbon like and lies in cingulum or annulus. The two types of flagella beats in different directions
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.