NTA Abhyas NEET2020BotanyBiological ClassificationPractice
Which of the following is correct regarding the organism given below?
Options
- AThis organism has a cell wall made up of a protein called a pellicle.
- BIt is a flagellated protozoan.
- CIt is both phototrophic and heterotrophic in nature.
- DToxins released by them may even kill other marine animals such as fish.
Correct answer
D. Toxins released by them may even kill other marine animals such as fish.
Step-by-step solution
These organisms are mostly marine and photosynthetic. They appear yellow, green, brown, blue or red depending on the main pigments present in their cells. The cell wall has stiff cellulose plates on the outer surface. Most of them have two flagella, one lies longitudinally and the other transversely in a furrow between the wall plates. Very often, red dinoflagellates (example: Gonyaulax ) undergo such rapid multiplication that they make the sea appear red (red tides). Toxins released by such large numbers may even