Question : A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed?
Option 1: From brown to blue-black
Option 2: From brown to orange-red
Option 3: From blue to pink
Option 4: From pink to blue-green
Correct Answer: From brown to blue-black
Solution : The correct option is From brown to blue-black.
Potatoes include starch, a type of carbohydrate made up of amylose and amylopectin. Iodine and starch combine to give potatoes their characteristic blue-black colour. The iodine molecules react with the amylose and absorb it into its branches, giving the material a rich blue hue.
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