Directions for: The questions consist of two statements each, printed as assertion and reason. While answering these questions you are required to choose any one of the following five responses A. If both the Assertion and the Reason are true and the Reason is a correct explanation of the Assertion. B. If both the Assertion and the Reason are true but the Reason is not a correct explanation of Assertion. C. If the Assertion is true but the Reason is false. D. If both the Assertion and the Reason are false. E. If Assertion is false but Reason is true.
Assertion: Red algae contribute in producing coral reefs. Reason: Some red algae secrete and de calcium carbonate over their walls.A) A
B) B
C) C
D) D
E) E
Correct Answer: A
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.
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