In the picture below, after adding iodine, potato turns bluish black. What does this suggest?

Potato has proteins in it.

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Potato has starch in it.

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Potato has lots of enzymes which act on iodine.

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Potato has more lipids in it.

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Solution

The correct option is B
Potato has starch in it.

Iodine solution is used to detect the presence of starch in any sample. With starch, iodine turns bluish-black indicating the presence of starch in the sample. Potatoes are rich in starch and thus show a positive test with iodine.

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Adding iodine solution on a cut potato turns it dark blue in color. Why is this so?

Iodine solution turned blue black when poured on a potato slice because it contains:

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