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Synthesis of each molecule of glucose in photosynthesis involves -

1. 8 molecules of ATP
2. 6 molecules of ATP
3. 18 molecules of ATP
4. 10 molecules of ATP

Correct answer: 18 molecules of ATP

Solution

The synthesis of one molecule of glucose during photosynthesis requires a total of 18 ATP molecules, as it involves multiple cycles of the Calvin cycle where ATP is used to convert carbon dioxide into glucose.

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