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In the reduction phase of the Calvin cycle, ATP is used for

(a) phosphorylation, and NADPH for reduction Correct
(b) carboxylation of RuBP Your answer
(c) reduction, and NADPH for phosphorylation Your answer
(d) splitting of water Your answer

Your answer: Correct answer: (a)

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Explanation

Why (a) is correct

In the reduction stage, ATP is used to phosphorylate 3-PGA, and NADPH is used to reduce it to triose phosphate.

Why the other options are wrong

(b) · your answer Carboxylation does not use ATP.
(c) · your answer This reverses the roles: NADPH reduces and ATP phosphorylates.
(d) · your answer Water splitting is part of the light reaction and does not use ATP.

NCERT point: Reduction: 2 ATP + 2 NADPH per CO₂.

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Similar questions

How many molecules of CO2 must be fixed to produce one molecule of glucose? The input and output of the Calvin cycle for one glucose is: In - 6 CO2, 18 ATP, 12 NADPH; Out - one glucose, 18 ADP and Which statement about 3-PGA is correct?