Estuaries possess distinct blooms of excessive growth of a pigmented dinoflagellate. These blooms are called

1. red tides
2. sea tides
3. black tides
4. sea flowers

Explanation

Option (a) is correct

• Certain dinoflagellates multiply rapidly under favourable conditions, producing a phenomenon called red tides. These blooms often discolour water (usually reddish or brownish) and may release toxins harmful to marine life and humans.

Answer: (a) red tides