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Which of the following does NOT take place in the mesophyll cells of a C₄ plant?

(a) formation of oxaloacetic acid Your answer
(b) carboxylation of RuBP by RuBisCO Correct
(c) regeneration of PEP Your answer
(d) fixation of CO₂ by PEPcase Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

RuBisCO is absent from the mesophyll cells of C₄ plants, so carboxylation of RuBP does not happen there.

Why the other options are wrong

(a) · your answer OAA is formed in the mesophyll.
(c) · your answer PEP is regenerated in the mesophyll.
(d) · your answer PEPcase fixes CO₂ in the mesophyll.

NCERT point: Carboxylation of RuBP happens in the bundle sheath.

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