Which of the following is the site of photolysis of water?

Stroma of chloroplast

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Cristae of chloroplast

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Ribosome of chloroplast

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Lumen of thylakoid sacs

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Solution

The correct option is D Lumen of thylakoid sacs
The photolysis of water occurs during light reaction. The site for occurrence of photolysis is thylakoid lumen. The photolysis of water releases protons, which accumulate in the lumen and contribute to the electrochemical gradient of protons. The electrons released are used up to fill the electron hole in the reaction centre of PSII and oxygen molecule is released as by product of photosynthesis.
So, the correct answer is 'Lumen of thylakoid sacs'

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