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The first stable product of CO₂ fixation in sorghum is

(a) oxaloacetic acid Correct
(b) phosphoglyceric acid Your answer
(c) succinic acid Your answer
(d) pyruvic acid Your answer

Your answer: Correct answer: (a)

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Explanation

Why (a) is correct

Sorghum is a C₄ plant. In C₄ plants, PEP takes up CO₂ in the mesophyll cells, and the first stable product is the 4-carbon oxaloacetic acid (OAA).

Why the other options are wrong

(b) · your answer PGA is the first product in C₃ plants.
(c) · your answer Succinic acid is part of the Krebs cycle, not C₄ fixation.
(d) · your answer Pyruvic acid is formed when malic acid is decarboxylated in the bundle sheath, not as the first product.

NCERT point: Maize, sugarcane and sorghum are C₄ plants.

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