Question

Where do the protons in the stroma come from?

Answer 1

Answer:

During this process protons are transferred from the stroma in to the thylakoid lumen, which generates a protons motive force across the thylakoid membrane.

The light induced electron transfer in photosynthesis drives protons into the thylakoid lumen.

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Answer 2

Answer: In the light dependent reaction of photosynthesis, the protons in the thylakoids (used to generate ATP) come from the photolysis of water and from protons being proton pumped from the stroma into the thylakoids.

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