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Question

In a chloroplast the highest number of protons are found in:

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

The correct option is B Lumen of thylakoids
Photolysis of water occurs in the lumen of thylakoids. During the process of photolysis light energy and catalysts interact to drive the splitting of water molecules into protons (H+), electrons, and oxygen gas.
Hence in a chloroplast lumen of the thylakoids have the highest number of protons.

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