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How many ATPand NADPH_{2} are required for the synthesis of one molecule of Glucose during Calvin cycle?

Option: 1

12\; ATP and 12 NADPH_{2}


Option: 2

18\: ATP and 12\; NADPH_{2}\: \:


Option: 3

12\; ATP and 16\; NADPH_{2}


Option: 4

18\: \: ATP and 16\: \: NADPH_{2}


Answers (1)

best_answer

During the Calvin cycle, also known as the light-independent reactions of photosynthesis, glucose is synthesized from carbon dioxide (CO2) using ATP and NADPH2 as energy sources. The overall reaction for glucose synthesis can be represented as follows:

6 CO2 + 18 ATP + 12 NADPH2 → C6H12O6 (glucose) + 18 ADP + 18 Pi + 12 NADP+

For the synthesis of one molecule of glucose, 6 molecules of carbon dioxide are required. Each carbon dioxide molecule undergoes a series of reactions involving ATP and NADPH2 to form one glucose molecule.

Each carbon dioxide molecule requires 3 ATP molecules for its fixation and reduction, and 2 NADPH2 molecules for its reduction. Therefore, for 6 CO2 molecules, we need 6 × 3 = 18 ATP molecules and 6 × 2 = 12 NADPH2 molecules.

Hence, the correct option is Option 2) 18 ATP and 12 NADPH2.

Posted by

shivangi.bhatnagar

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