General Science • BiologyHard
What is the primary mechanism by which non-cyclic photophosphorylation differs from cyclic photophosphorylation during the light-dependent reactions of photosynthesis in higher plants?
A. Non-cyclic photophosphorylation involves both Photosystem I and Photosystem II, resulting in the production of NADPH and oxygen along with ATP.✓ Correct Answer
B. Non-cyclic photophosphorylation occurs exclusively in the stroma and produces only ATP without oxygen evolution.
C. Cyclic photophosphorylation utilizes water splitting to generate reducing equivalents for carbon dioxide fixation.
D. Cyclic photophosphorylation requires external electron donors such as hydrogen sulfide to replenish lost electrons.
💡 Solution & Explanation
Non-cyclic photophosphorylation involves both Photosystem II and Photosystem I working in a Z-scheme, leading to photolysis of water, oxygen evolution, reduction of NADP+ to NADPH, and ATP synthesis. Cyclic photophosphorylation involves only Photosystem I, where excited electrons cycle back through the electron transport chain to generate ATP without producing NADPH or splitting water. Both processes take place across the thylakoid membrane inside chloroplasts.
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