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For a long time the primary CO₂ acceptor was believed to be a

(a) 4-carbon compound Your answer
(b) 6-carbon compound Your answer
(c) 5-carbon compound Your answer
(d) 2-carbon compound Correct

Your answer: Correct answer: (d)

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Explanation

Why (d) is correct

NCERT says that for a long time the primary CO₂ acceptor was assumed to be a 2-carbon molecule. Later it was found to be the 5-carbon RuBP.

Why the other options are wrong

(a) · your answer A 4-carbon compound (OAA) is a product in C₄ plants, not the assumed acceptor.
(b) · your answer A 6-carbon acceptor was never the assumption.
(c) · your answer The 5-carbon RuBP was the actual acceptor found later, not the earlier assumption.

NCERT point: Because the first product was a 3-carbon acid, a 2-carbon acceptor was first expected.

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RuBisCO is so named because it In the reduction stage of the Calvin cycle, the energy carriers used per CO2 fixed are The regeneration of RuBP requires, per CO2 fixed,