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B
Alkaline pH
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C
Neutral pH
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D
Both B and C.
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Solution
The correct option is A Acidic pH Lysosomes are polymorphic minute vesicles filled with acid hydrolases. The hydrolytic enzymes present in lysosomes are active at acidic pH (4-5). The acidic pH is actively maintained in lysosomes with the help of proton pumps located in the lysosomal membrane.