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? A. From brown to blue-black B. From brown to orange-red C. From blue to pink D. From pink to blue-green

The correct answer is A. From brown to blue-black.

When iodine solution is placed on a cut surface of a potato tuber, a blue-black color change will be noticed. This is because the iodine reacts with the starch in the potato to form a complex that has a blue-black color.

The other options are incorrect because they do not describe the correct color change that will be observed. Option B is incorrect because the color change is not from brown to orange-red. Option C is incorrect because the color change is not

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