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Carboxylation of one molecule of RuBP produces

(a) one molecule of 3-PGA Your answer
(b) two molecules of 3-PGA Correct
(c) two molecules of pyruvate Your answer
(d) one molecule of OAA Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

RuBP (5C) + CO₂ gives an unstable 6-carbon compound that splits at once into two molecules of 3-PGA (3C each).

Why the other options are wrong

(a) · your answer Two molecules, not one, are formed.
(c) · your answer Pyruvate is not formed in carboxylation.
(d) · your answer OAA is formed when PEP is carboxylated in C₄ plants.

NCERT point: 5C + 1C → 2 × 3C.

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