What two factors contribute to build-up of the proton gradient across the thylakoid membrane in non-cyclic phosphorylation

The chlorophyll obtains its electrons from water by producing oxygen as a by products. During the electron transport process H+ is pumped across the thylakoid membrane, and resulting electrochemical proton gradient drives the synthesis of ATP in the stroma. In final step high energy loaded onto NADP+.

Explanation:

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it would be rhyolitic hope this