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C₄ plants differ from C₃ plants with respect to

(a) the primary CO₂ acceptor and the first stable product Correct
(b) the number of NADPH used per glucose in the Calvin cycle Your answer
(c) the pigments involved in photosynthesis Your answer
(d) the final product of photosynthesis Your answer

Your answer: Correct answer: (a)

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Explanation

Why (a) is correct

C₄ plants differ in the primary CO₂ acceptor (PEP instead of RuBP) and the first stable product (OAA, 4C, instead of PGA, 3C).

Why the other options are wrong

(b) · your answer The Calvin cycle itself uses the same NADPH per glucose in both.
(c) · your answer Both have the same photosynthetic pigments.
(d) · your answer Both finally produce sugars.

NCERT point: C₃ and C₄ are named after the number of carbons in the first stable product.

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