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During ETS of photosynthesis, H⁺ ions or protons are

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Pumped out from thylakoid lumen always

Always in high concentration in stroma

Not required to form ATP

High in concentration inside the thylakoid lumen

answer is B.

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Detailed Solution

H⁺ ions are pumped into the thylakoid lumen during ETS from stroma due to PQ cycle. Photolysis of water is also source of protons in lumen.

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