Question

In the vast marine ecosystem, certain seas develop red colouration. This red colour is due to the presence of a large population of which one of the following organisms?

• A. Trichodesmium erythraeum
• B. Diatoms and members of red algae
• C. Physarum
• D. Dinoflagellates

Answer 1

The correct option is D Dinoflagellates

Dinoflagellates

Red dinoflagellates like Gonyaulax multiply rapidly and accumulate in large numbers in some parts of the sea. This turns the sea red in colour and the phenomenon is known as red tide. Gonyaulax also releases toxins into the water bodies which kill marine organisms.