Direction in which protons flow during chemiosmosis in chloroplasts are : from the stroma into the thylakoid space.
The chemiosmotic process in chloroplasts occurs during photosynthesis. The energy of electron is used to pump proton from stroma into the thylakoid lumen and when protons move back to stroma then they pass through ATP synthase.
The process of moving ions to the other side of a biological membrane is known as chemiosmosis.
Electrochemical gradient is generated in chemiosmosis which is used to drive ATP synthesis. During this process, hydrogen ions get collected in the thylakoid membranes.
To know more about chemiosmosis, refer
https://brainly.com/question/896642
#SPJ4