The source of O_2 liberated in photosynthesis | vedclass

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(C) The oxygen evolved during photosynthesis in green plants originates from the photolysis of water $(H_2O)$.This was experimentally proven by $C$.$B

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Water

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(C) The oxygen evolved during photosynthesis in green plants originates from the photolysis of water $(H_2O)$.This was experimentally proven by $C$.$B$. van Niel,who demonstrated that purple and green sulfur bacteria use $H_2S$ instead of $H_2O$ as a hydrogen donor,releasing sulfur instead of oxygen.Later,this was confirmed using the oxygen isotope $^{18}O$ by Ruben and Kamen,which proved that the $O_2$ released comes from water and not from carbon dioxide $(CO_2)$.

The source of $O_2$ liberated in photosynthesis in green plants is:

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