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The biosynthetic phase of photosynthesis uses

(a) chlorophyll and light only Your answer
(b) ATP, NADPH, CO₂ and water Correct
(c) ADP and NADP⁺ only Your answer
(d) O₂, glucose and light Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

The biosynthetic (dark) phase uses ATP and NADPH from the light reaction, together with CO₂ and water, to make sugars.

Why the other options are wrong

(a) · your answer Chlorophyll and light are needed for the light reaction, not the biosynthetic phase.
(c) · your answer ADP and NADP⁺ are formed from it, not used by it.
(d) · your answer O₂ and glucose are products, not inputs.

NCERT point: The biosynthetic phase is not directly light-driven but depends on ATP and NADPH.

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