What Will Happen to the PH Inside a Thylakoid That

Question

What will happen to the pH inside a thylakoid that is exposed to light?
A)It will increase
B)It will decrease
C)It will not change

Accepted Answer

The pH inside a thylakoid exposed to light will decrease. This is because during photosynthesis, light energy is used to pump hydrogen ions (H+) from the stroma of chloroplasts into the thylakoid space, creating a proton gradient that can be used to produce ATP through chemiosmosis. As a result, the thylakoid space becomes more acidic (lower pH) than the stroma.