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Rajesh cut the apple, after sometime he ...

Rajesh cut the apple, after sometime he observed brown colour on the apple pieces.
Predict the reason.

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1) When apple pieces exposed to atmosphere, their colour changes into brownish.
2) Because an oxidation reaction takes place.
3) Oxidation is the reaction of oxygen molecules with different living tissues.
4) Apples (and also pears, bananas, potatoes, etc.) contains enzymes called polyphenol oxidize (or tyrosine), which reacts with oxygen and changes the colour on the cut surface of the fruit.
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