Assertion :Protons produced by photolysis accumulate in lumen of thylakoids. Reason: Photolysis occurs in the lumen of thylakoids.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The chemiosmotic hypothesis was explained by P. Mitchell. This mechanism explains how ATP is synthesised in the chloroplast. It is based on proton gradient. There are several processes that take place during activation of electrons and their transport which lead to the development of a proton gradient. Photolysis of water is the first process of this activation. The splitting of the water molecule takes place on the inner side of the thylakoid membrane and so the hydrogen ions (protons) that are produced, they accumulate within the lumen of the thylakoids. Thus. the correct answer is option A.

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