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If a C₄ plant uses 30 ATP per glucose, the extra ATP per glucose compared with a C₃ plant is used mainly for

(a) regenerating PEP in the mesophyll Correct
(b) reducing NADP⁺ in the mesophyll Your answer
(c) forming starch in the bundle sheath Your answer
(d) splitting water in the bundle sheath Your answer

Your answer: Correct answer: (a)

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Explanation

Why (a) is correct

The extra ATP (12 per glucose) is used mainly to regenerate PEP from pyruvate in the mesophyll cells.

Why the other options are wrong

(b) · your answer NADP⁺ reduction does not use ATP.
(c) · your answer Starch formation is not the main extra cost.
(d) · your answer Water splitting does not use ATP.

NCERT point: The 3-carbon molecule from the bundle sheath returns to the mesophyll, where it is converted to PEP again.

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