Answer
It was hypothesized that hydrogen from water was reallocated to glucose during aerobic photosynthesis, leaving the oxygen to be released as a byproduct. This hypothesis was later confirmed by using an isotopic oxygen to track the flow of oxygen in plants. The results confirmed that water is the source of the oxygen released by photosynthesis.
Work Step by Step
It was hypothesized that hydrogen from water was reallocated to glucose during aerobic photosynthesis, leaving the oxygen to be released as a byproduct. This hypothesis was later confirmed by using an isotopic oxygen to track the flow of oxygen in plants. The results confirmed that water is the source of the oxygen released by photosynthesis.