Question

Non cyclic photophosphorylation differs from cyclic photophosphorylation because of

• A. O${}_2$ releases
• B. Reduction of NADP
• C. Synthesis ATP
• D. A and B both

Answer 1

Answer: (D)

A and B both

Cyclic photophosphorylation provides energy for the calvin cycle and involves only p680 in photosystem ll. Non-cyclic photophosphorylation involves p700 in photosystem l and p680 in photosystem ll. Cyclic photophosphorylation produces ATP. Non-cyclic photophosphorylation produces NADPH by reducing NADP and ATP. Oxygen is released during non-cyclic photophosphorylation.

Thus, the correct answer is 'A and B both.'