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Question

In chloroplast, the highest number of protons are found in


A
Antenna complex
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B
Stroma
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C
Lumen of thylakoids
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D
Inter-membrane space
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Solution

The correct option is D Lumen of thylakoids
During photosynthetic electron transport, protons (H$$^+$$) accumulate in the thylakoid space. These protons are released into thylakoid space after each split of water molecule during photooxidation and after each electron transport between PQH$$_2$$ to cytochrome-f. Increase in the number of protons in the thylakoid space results in an increase in a proton gradient.
Hence, the correct answer is 'Lumen of thylakoids'.

Biology

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