Question

The reaction that does not contribute for proton gradient across thylakoid membrane.

• A. Splitting of water molecule on inner side of membrane
• B. Quinone cycle
• C. Removal of protons from stroma for the reduction of NADP
• D. Electron transport from plastocyanin to PSI

Hint:

In the Z-scheme, focus on where protons are pumped (e.g. cytochrome complex), not just electron flow.

Answer 1

The Correct Option is D

The movement of electrons from plastocyanin to PSI does not result in proton translocation. Other processes like photolysis, quinone cycle, and NADP reduction contribute to proton gradient.