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In photosynthesis, the role of NADPH made during the light reactions is to
ACarboxylate RuBP to form 3-PGA in the stroma compartment
BProvide reducing power for the Calvin cycle reactions
CDrive ATP synthesis directly through the proton gradient
DSplit water molecules to release O2 in the thylakoid lumen
Answer & Solution
Correct answer: B. Provide reducing power for the Calvin cycle reactions
NADPH carries reducing power (high-energy electrons + proton) from the light reactions to the Calvin cycle. It reduces 1,3-BPGA to G3P (the second step of the reduction phase of the Calvin cycle). ATP is the energy currency; NADPH is the reductant.
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