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In C₃ plants, the first stable product of photosynthesis in the dark reaction is

(a) malic acid Your answer
(b) phosphoglyceraldehyde Your answer
(c) oxaloacetic acid Your answer
(d) 3-phosphoglyceric acid Correct

Your answer: Correct answer: (d)

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Explanation

Why (d) is correct

In C₃ plants, RuBisCO joins CO₂ with RuBP, and the first stable product is the 3-carbon compound 3-phosphoglyceric acid (PGA).

Why the other options are wrong

(a) · your answer Malic acid is formed in C₄ plants, not as the first product in C₃ plants.
(b) · your answer Phosphoglyceraldehyde is formed later, when PGA is reduced.
(c) · your answer Oxaloacetic acid is the first product in C₄ plants.

NCERT point: C₃ plants are named after their first product, the 3-carbon PGA.

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