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In photosynthesis, energy from the light reaction is passed to the dark reaction in the form of
Your answer:
Correct answer: (a)
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Explanation
Why (a) is correct
The light reaction makes ATP and NADPH. These two carry the energy and reducing power to the dark reaction (Calvin cycle), where they are used to fix CO2 into sugar. Of the options, ATP is the energy carrier.
Why the other options are wrong
- (b) · your answer RuDP (RuBP) is the CO2 acceptor made within the Calvin cycle, not a product of the light reaction.
- (c) · your answer ADP is the low-energy form; it goes back to the thylakoids to be made into ATP.
- (d) · your answer Chlorophyll stays in the thylakoids; it does not carry energy to the stroma.
NCERT point: Assimilatory power = ATP + NADPH, produced in the light reaction and used in the Calvin cycle.
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