In chloroplast, the highest number of protons are found in

Antenna complex

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Stroma

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Lumen of thylakoids

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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'.

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Similar questions

Which of the following is true about Chloroplasts?

(i) Chloroplasts are minute oval bodies bounded by a double membrane.

(ii) Their interior contains closely packed flattened sacs called thylakoids.

(iii) There are over 60 chloroplasts in a cell.

(iv) The pigment chlorophyll is contained in the empty spaces of thylakoids.

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