In 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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