Question

Red oceanic tides can be due to

• A. Diatoms
• B. Dinoflagellates
• C. Red algae
• D. Blue-green algae

Answer 1

The correct option is B Dinoflagellates

Dinophyceae/Pyrrophytes are reddish brown algae which are characterized by presence of pigment peridinin that impart red-brown color. Great population explosions of dinoflagellates makes the water to turn reddish and is referred to as Red tides which are poisonous and destructive for living organisms due to production of toxins by dinoflagellates.

This makes option B correct.