Q.

The stain used to observe mitochondria under light microscope is 

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a

Janus green B

b

Methylene blue

c

Toludine blue

d

Resorsinol blue

answer is A.

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Detailed Solution

Janus green B is used to stain mitochondria. When oxygen is available in mitochondria, the stain is oxidised and mitochondria appear as blue colored. If oxygen is low or absent the stain is reduced and the mitochondria appear pink colored. 

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