Question

Assertion: Cyclic pathway of photosynthesis first appeared in some eubacterial species.
Reason: Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved.

• A. If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
• B. If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
• C. If Assertion is true, but Reason is false.
• D. If both Assertion and Reason are false.

Answer 1

Answer: (B)

Cyclic pathway of photosynthesis appeared first in some eubacterial species for ATP production. Non cyclic photophosphorylation is the only natural process which adds molecular oxygen to the atmosphere by the photolysis of water.