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Question

If 4 molecules of glucose are synthesized during photosynthesis, how many ATP molecules are released and how many molecules of ATP are utilized respectively?

A
8 ATP, 72 ATP
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B
2 ATP, 18 ATP
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C
8 ATP, 36 ATP
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D
4 ATP, 36 ATP
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Solution

The correct option is B 8 ATP, 72 ATP
For the synthesis of one molecule of glucose by photosynthesis, 2 ATP molecules are released and 18 ATP molecules are utilized. 18 ATP molecules are utilized in the sense that in most of the plants the mode of CO2 fixation is C3 cycle or Calvin cycle. In C3 cycle for each molecule of CO2 to be fixed, 3 ATP are required. Thus, for the synthesis of one Glucose molecule, 6 CO2 molecules are fixed. Thus, 18 ATP molecules in total are utilized for the formation of one Glucose molecule.
Hence, for the synthesis of 4 glucose molecules in photosynthesis,
ATP molecules released = 4 × 2 = 8
ATP molecules utilized = 4 × 18 = 72.
Thus the correct answer is A.

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