alleryThe 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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