What is red tide?

Biology Biological Classification Kingdom–Protista Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 12, 2026

What is red tide?

Accumulation of cell wall deposits of red algae is called red tide

Accumulation of red blood cells in water

Colouration of water due to rapid multiplication of red dinoflagellates

Spread of chrysophytes due to rapid reproduction

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The correct answer is:

Red tide occurs when certain dinoflagellates multiply rapidly in water, causing the water to appear red or reddish-brown due to their pigments. Some species also release toxins that can harm marine life and humans.

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