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There is no other source of hydrogen available to the plant to make carbohydrates. Atmospheric air supplies both oxygen and carbon in the form of carbon dioxide, but most of this oxygen, from both CO2 and H2O (produced by the photodisassociation of water) is released by the plant. Molecules of water provide the protons (hydrogen) to form carbohydrates such as glucose (C6H12O6).

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13y ago

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