Assertion : Each molecule of ribulose -1, 5- | vedclass

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Question

(C) Each molecule of ribulose $-1, 5-$ bisphosphate $(RuBP)$ fixes one molecule of carbon dioxide $(CO_2)$ during the carboxylation step of the Calvin

Vedclass · Accepted Answer

If the Assertion is correct but Reason is incorrect.

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(C) Each molecule of ribulose $-1, 5-$ bisphosphate $(RuBP)$ fixes one molecule of carbon dioxide $(CO_2)$ during the carboxylation step of the Calvin cycle,resulting in the formation of two molecules of $3-$phosphoglyceric acid $(3-PGA)$.The fixation and reduction of one molecule of $CO_2$ requires three molecules of $ATP$ and two molecules of $NADPH$ (for the reduction phase and regeneration of $RuBP$).Therefore,the Assertion is correct,but the Reason states the requirement as three $NADPH$ and two $ATP$,which is the reverse of the actual requirement (two $NADPH$ and three $ATP$). Thus,the Reason is incorrect.

Assertion : Each molecule of ribulose $-1, 5-$ bisphosphate fixes one molecule of $CO_2$.
Reason : Three molecules of $NADPH$ and two $ATP$ are required for fixation of one molecule of $CO_2$.

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Assertion : Each molecule of ribulose $-1, 5-$ bisphosphate fixes one molecule of $CO_2$.Reason : Three molecules of $NADPH$ and two $ATP$ are required for fixation of one molecule of $CO_2$.