The labled hydrogen would end up in the sugar produced during the photosynthesis.
The term photosynthesis is the process by which there is the combination of carbon dioxide and water in the presence of sunlight in order to form sugars and oxygen.
There are two stages in the process of photosynthesis, the light stage and the dark stage. In the light stage, there is the splitting of the water molecule and in the dark stage there is the making of the sugars. The hydrogen that was part of the water would end up in the sugars.
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