Question

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

• A. Both A and R are correct and R is the correct explanation of A
• B. Both A and R are correct and R is not correct explanation of A
• C. A is correct, but R is incorrect
• D. Both A and R are incorrect

Answer 1

The correct option is B Both A and R are correct and R is not correct explanation of A

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.