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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
  1. A is correct, but R is incorrect
  2. Both A and R are incorrect
  3. Both A and R are correct and R is the correct explanation of A
  4. Both A and R are correct and R is not correct explanation of A


Solution

The correct option is D 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.

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