I have spotted a mistake in this video! In cyclic photophosphorylation the electrons do not go all the way back to PSII, but just go back to the electron transport chain after PSII and then down to PSI again. So ONLY PSI is involved in cyclic photophosphorylation.

Get the full teaching PowerPoint for the whole of respiration and photosynthesis here: http://www.slideshare.net/mrexham/al...