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In a chloroplast the highest number of protons are found in

1. stroma
2. lumen of thylakoids
3. inter membrane space
4. antennae complex

Correct answer: lumen of thylakoids

Solution

During the light reactions, the photosynthetic electron transport chain pumps protons from the stroma into the thylakoid lumen, and water splitting also adds protons there. This makes the thylakoid lumen the compartment with the highest proton concentration.

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