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In C₄ plants, the initial CO₂ fixation is carried out by

(a) sclerenchyma Your answer
(b) guard cells Your answer
(c) chlorenchyma and hypodermis Your answer
(d) mesophyll cells Correct

Your answer: Correct answer: (d)

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Explanation

Why (d) is correct

The first fixation of CO₂ in C₄ plants takes place in the mesophyll cells, which have PEP carboxylase.

Why the other options are wrong

(a) · your answer Sclerenchyma is dead supporting tissue; it does not photosynthesise.
(b) · your answer Guard cells regulate stomata; they do not carry out C₄ fixation.
(c) · your answer Hypodermis is not the site of C₄ fixation; the mesophyll is.

NCERT point: C₄ acids made in the mesophyll are transported to the bundle sheath cells.

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