Consider the formula for glucose: cap c sub 6 cap h sub 12 cap o sub 6 In the processes of photosynthesis, what supplies the hydrogen cap h used in the formation of glucose?

During photosynthesis, water molecules are split, supplying hydrogen that is used to form glucose. Chlorophyll captures light energy, and carbon dioxide supplies the carbon and some oxygen, but neither supplies the hydrogen. Therefore, the correct choice is water.

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