Question

few drops of dilute iodine solution is added to both the test tubes test tube a is crushed potato + salive

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Answer 1

Iodine Solution converts Starch into Blue-Black.

As it tells that Test Tube contained crushed potatoes with saliva, that means that the potatoes have been chewed. As Salivary amylase/enzyme break downs Starch into simple sugars. So, when iodine solution is added, there was no starch and so the solution couldn't convert blue-black.

As it tells that test tube B contained only crushed potatoes but not chewed, so when iodine solution was added, it contained Starch and will thus, turn Blue -Black.

SO conclusion; Test Tube A will have no color change.

                         Test Tube B will have color changed to blue-black.

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Answer 2

Answer:

test tube A has no changes

Explanation:

since saliva contains amylase that digests starch. and potato is a source of starch, so if u mix potato that is starch and saliva that contains amylase is breaks down the potato because its and starch and that's what amylase does in the mouth. it will not have any colour changes in test tube A when iodine is present.