NEET 2016 Biology question

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

(1)Stroma
(2)Lumen of thylakoidsCorrect
(3)Inter membrane space
(4)Antennae complex

Answer: (2)

Solution

During the light reaction, splitting of water by PS II releases protons into the thylakoid lumen, and the plastoquinone/cytochrome b6f complex also pumps protons from the stroma into the lumen as electrons are transported. Hence the proton concentration is highest in the lumen of thylakoids, creating the gradient that

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Question ID VK-091937