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In a chloroplast the highest number of protons are found in
A
lumen of thylakoids.
B
inter membrane space.
C
antennae complex.
D
stroma.
Explanation
Protons accumulate in the thylakoid lumen.
Detailed Solution
Photolysis (splitting of water by activated chlorophyll) takes place in the lumen of the thylakoid, producing protons there. These protons are used to reduce $NADP^+$ to NADPH in the stroma.