alleryOxygen evolved during photosynthesis comes from
AReduction of ATP at thylakoid
BSplitting of water in PS II
CReduction of CO2 in stroma
DReduction of NADP+ in light
Answer & Solution
Correct answer: B. Splitting of water in PS II
Van Niel demonstrated, and radioisotope studies confirmed, that the O2 evolved in photosynthesis comes from water (photolysis at PS II), not from CO2. 2H2O gives 4H+ + O2 + 4e-.
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