Prove that the oxygen comes from water and not from the carbon dioxide.

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Anonymous · Accepted Answer

Van Niel’s observation : Van Niel observed that photosynthesis is a light-dependent reaction and the O₂ comes from the water and not carbon dioxide.. In green plants H₂O is the hydrogen donor and O₂ is the product. whereas in purple and green bacteria the hydrogen donor is H₂S and the product is sulphur.

Photosynthesis in Higher Plants

Prove that the oxygen comes from water and not from the carbon dioxide.