Question:
The ultimate gain of light reaction in photosynthesis is
The ultimate gain of light reaction in photosynthesis is
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Light reaction yields Assimilatory Power: ATP + NADPH (used in Calvin cycle to fix $\text{CO}_2$ into sugars).
Updated On: Sep 15, 2026
- ATP & NADPH
- NADPH
- only ATP
- only GTP
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Light-dependent reactions in thylakoid membranes convert solar photonic energy into chemical energy.
Step 2: Detailed Explanation:
Through non-cyclic and cyclic photophosphorylation along the Z-scheme electron transport chain (Photosystem II and Photosystem I), absorbed photon energy is used to photolyze water, generating molecular oxygen ($O_2$), ATP (via ATP synthase proton gradient), and reduced NADPH (via ferredoxin-NADP+ reductase).
ATP and NADPH constitute the assimilatory power consumed during the dark reaction (Calvin cycle) for $\text{CO}_2$ reduction.
Step 3: Final Answer:
Therefore, the ultimate gain of the light reaction is ATP and NADPH.
Light-dependent reactions in thylakoid membranes convert solar photonic energy into chemical energy.
Step 2: Detailed Explanation:
Through non-cyclic and cyclic photophosphorylation along the Z-scheme electron transport chain (Photosystem II and Photosystem I), absorbed photon energy is used to photolyze water, generating molecular oxygen ($O_2$), ATP (via ATP synthase proton gradient), and reduced NADPH (via ferredoxin-NADP+ reductase).
ATP and NADPH constitute the assimilatory power consumed during the dark reaction (Calvin cycle) for $\text{CO}_2$ reduction.
Step 3: Final Answer:
Therefore, the ultimate gain of the light reaction is ATP and NADPH.
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