How is H2O a by-product of light reactions in photosynthesis??

doesnt say that in my copy of destroyer.

I have the 2007, so looks like a mistake they took out.

What does yours say for the answer?

Asks which statement is false.
Answer: during light rxn, low [H+] produced in thylakoids

Yeh I don't have it either so I guess it was some kind of mistake

He probably meant to say 1/2 O2 is a by-product of the light rxn

water is split in the light reaction....