Question

Question #62f05

Answer 1

From photolysis

Explanation:

During light reaction of photosynthesis, In non-cyclic electron flow, when Photosystem II absorbs light, an electron is excited to a higher energy level in the reaction center of Chlorophyll `P_680`. Thus a hole has been created and the chlorophyll has become a very strong oxidizing agent. It's electron hole must be filled.
Thus an enzyme extracts electron from water. These electrons fill that hole. This reaction splits the water molecule into two hydrogen ions and one oxygen atom. The oxygen atom abrubptly combine with another oxygen atom to form `O_2`. This reaction of photosynthesis during which water is produced is known as photolysis.
`H_2O` `to` `2H_+ + 2e^- + 1/2O_2`

https://www.quora.com/What-is-the-final-electron-accepter-in-noncyclic-photophosphorylation
Hope it helps...