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CAM plants separate the two carboxylations

(a) in space, using two different cell types Your answer
(b) in time, at night and in the day Correct
(c) by using only RuBisCO Your answer
(d) by using only PEPcase Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

CAM plants separate the two carboxylations in time: PEPcase fixes CO₂ at night, and RuBisCO fixes it in the day.

Why the other options are wrong

(a) · your answer Separation in space (two cell types) is the C₄ method.
(c) · your answer CAM plants also use PEPcase.
(d) · your answer CAM plants also use RuBisCO.

NCERT point: C₄ plants have two carboxylases: PEPcase in the mesophyll and RuBisCO in the bundle sheath.

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