Question

6.
A slice of bread gives a positive iodine test. However, if the slice is thoroughly
chewed, the test is negative. Explain giving reasons.
​

Answer 1

the reason behind this is-

the starch present in the bread as we chew it. Due to the absence of starch in the chewed bread, the iodine test shows a negative result

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Answer 2

Explanation:

It comes positive at first because it contains starch, after chewing it becomes negative because the saliva contains enzymes called salivary amylase which breaks down starch into simple sugars , like maltose and dextrin. When you chew the bread saliva digests the starch present in it hence it gives negative test.

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