Discussion
What provides electrons for the light reactions?
Answer: A
Water supplies the electrons for the light reactions.
Chlorophyll loses an electron when it absorbs a photon, and replaces it by splitting water:
\[ \mathrm{2H_2O \rightarrow 4H^+ + 4e^- + O_2} \]
The oxygen released is the by-product, and every molecule of it in the atmosphere came from this reaction.
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