Explain how during light reaction of photosynthesis, ATP synthesis is a chemiosmotic phenomenon.

The movement of ions across and down a semi-permeable membrane is called chemical movement. In ATP synthesis, ions move through the thylakoid membrane, which is a semi-permeable diaphragm, during the light photosynthesis reaction.

In addition, proton pumps pump ions with a proton gradient, which is finally synthesized in ATP. Because of these factors, ATP synthesis is called a chemiosmotic phenomenon during light reaction