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The molecular oxygen released during photosynthesis comes from
ACO₂ split at Photosystem I
Batmospheric O₂ recycled by chlorophyll
Cglucose oxidised in the stroma
Dphotolysis of water at Photosystem II
Answer & Solution
Correct answer: D. photolysis of water at Photosystem II
Photosystem II is where water is split: 2H₂O → 4H⁺ + 4e⁻ + O₂. This replenishes the electrons PS II loses. The O₂ exits as a by-product through the stomata. PS I doesn't split anything; CO₂ keeps its oxygen until the Calvin cycle.
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