Assertion: Red algae contribute in producing coral reef. ltbr. Reason: Some red algae secrete and deposit calcium carbonate our their walls.

Options

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B. If both assertion and reason are true but the reason is not a correct explanation of the assertion
C. If the assertion is true but the reason is false
D. If both the assertion and reason are false

Answer

a

Explanation

In some species of red algae called coralline algae, the cell walls become hardened with calcium carbonate. These algae hence important for the formation of coral reefs. Coral reefs are formed through the accumulation of calcareous exoskeletons of coral animals, cacareous red algae and molluscs. they form the foundation of reefs by secreting a calcium carbonate skeleton and provides protection for the coral polyps. Calcium carbonate is secreted continously by the coral colony.