alleryIn photolysis of water:
A1 O₂ from 1 H₂O
BNo O2 from water
CRandom
D2 H₂O → 4 H+ + 4 e- + O₂
Answer & Solution
Correct answer: D. 2 H₂O → 4 H+ + 4 e- + O₂
**Water splitting at OEC:** 2 H₂O → 4 H+ + 4 e- + O₂.
Requires 4 successive photons absorbed by PSII to advance OEC through 5 oxidation states.
4 protons go to thylakoid lumen (contributing to gradient).
4 electrons replace those lost from P680. O₂ is byproduct.
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