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The C₄ pathway concentrates CO₂ at the site of

(a) PEP carboxylase Your answer
(b) the stomatal pore Your answer
(c) ATP synthase Your answer
(d) RuBisCO Correct

Your answer: Correct answer: (d)

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Explanation

Why (d) is correct

The C₄ pathway concentrates CO₂ around RuBisCO in the bundle sheath, so RuBisCO works as a carboxylase and not as an oxygenase.

Why the other options are wrong

(a) · your answer PEPcase fixes the incoming CO₂; the CO₂ is concentrated later, around RuBisCO.
(b) · your answer CO₂ is not concentrated at the stomata.
(c) · your answer ATP synthase does not use CO₂.

NCERT point: This mechanism is the reason C₄ plants show no photorespiration.

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