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In a chloroplast the highest number of protons are found in
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- stroma
- lumen of thylakoids
- inter membrane space
- antennae complex
Correct Option: B
Proton concentration is higher in the lumen of thylakoid due to photolysis of water, H+ pumping and NADP reductase activity in stroma. During the light-dependent reaction, protons are pumped across the thylakoid membrane into the lumen making it acidic down to pH 4.
