Q.

Highly acidic region of chloroplast is 

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a

lumen of thylakoid

b

stroma

c

thylakoid membrane

d

periplastidial space

answer is B.

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Detailed Solution

During light reaction of photosynthesis, lumen shows very high concentration of protons due to photolysis of water and pumping of protons from stroma to lumen. Hence lumen is highly acidic.

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