Why are H+ ions pumped into the thylakoid space as the electrons pass through the cytochrome complex from PS2 to PS1 during photosynthesis?

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    $\begingroup$ This is covered in most texts of biochemistry. Have you tried to find the answer yourself as explained in the Help Centre? Try, for example, Section 19.3 of Berg et al. online. $\endgroup$ – David Jan 16 '18 at 14:54