Q. Assertion : Red algae contribute in producing coral reefs.
Reason : Some red algae secrete and deposit calcium carbonate over their walls.

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Solution:

Coral reefs are formed by the accumulation of calcareous exoskeletons of coral animals, calcareous red algae and molluscs. In some species of red algae (coralline algae) cell wall become hardened with calcium carbonate. These are important for coral reef formation.