Question:
Cyclic photophosphorylation results in the formation of
Cyclic photophosphorylation results in the formation of
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Cyclic = ATP only; Non-cyclic = ATP + NADPH + O2.
Updated On: Jul 18, 2026
- ATP and NADPH
- NADPH
- ATP, NADPH, O2
- ATP
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The Correct Option is D
Solution and Explanation
Step 1: Understanding cyclic photophosphorylation.
Cyclic photophosphorylation occurs in photosystem I where electrons cycle back to the same chlorophyll molecule instead of reducing NADP+.
Step 2: Electron flow.
Electrons excited from chlorophyll return back through electron transport chain components, generating a proton gradient.
Step 3: ATP synthesis.
The proton gradient drives ATP synthase, producing ATP. However, no NADPH or oxygen is produced in this pathway.
Step 4: Comparison with non-cyclic photophosphorylation.
Non-cyclic produces ATP, NADPH, and O2, whereas cyclic produces only ATP.
Step 5: Functional significance.
Cyclic pathway is used when the cell requires extra ATP without needing NADPH.
Step 6: Final conclusion.
Thus, cyclic photophosphorylation produces ATP only.
Cyclic photophosphorylation occurs in photosystem I where electrons cycle back to the same chlorophyll molecule instead of reducing NADP+.
Step 2: Electron flow.
Electrons excited from chlorophyll return back through electron transport chain components, generating a proton gradient.
Step 3: ATP synthesis.
The proton gradient drives ATP synthase, producing ATP. However, no NADPH or oxygen is produced in this pathway.
Step 4: Comparison with non-cyclic photophosphorylation.
Non-cyclic produces ATP, NADPH, and O2, whereas cyclic produces only ATP.
Step 5: Functional significance.
Cyclic pathway is used when the cell requires extra ATP without needing NADPH.
Step 6: Final conclusion.
Thus, cyclic photophosphorylation produces ATP only.
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