In photosynthesis, for fixation of one molecule of glucose, the number of ATP and NADPH 2 required is

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During photosynthesis one Calvin cycle takes in only one carbon (as CO₂) at a time so, it takes six turns of the cycle to produce six-carbon compound (glucose). For the formation of one molecule of hexose sugar (glucose) 18 ATP and 12 $N A D P H_{2}$ are used, whereas 30 ATP and 12 $N A D P H_{2}$ are used during the C₄cycle.

These ATP and $N A D P H_{2}$ (assimilatory power) are produced during the light reaction of photosynthesis.

Botany - Photosynthesis in Higher Plants Question with Solution | TestHub

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