Q.

How many ATP and NADPH2 are required for the synthesis of one molecule of glucose during the Calvin cycle      [2023]

1 12 ATP and 16 NADPH2  
2 18 ATP and 16 NADPH2  
3 12 ATP and 12 NADPH2  
4 18 ATP and 12 NADPH2  

Ans.

(4)

In Calvin cycle, 3 molecules of ATP and 2 NADPH2 are required for every CO2 molecule entering the cycle. For one molecule of glucose, 6 turns of the cycle are required. Thus, 18 ATP and 12 NADPH2 are required for the synthesis of one molecule of glucose during the Calvin cycle.