Question

In the process of digestion.
A slice of bread gives a positive iodine test. However, if the slice is thoroughly
chewed, the test is negative. Explain giving reasons.
lain the necess of digestion in ruminants How do ruminants digest their food

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Answer 1

Answer:

The bread gives positive iodine test.

Explanation:

Because before it had starch in it so it gave the iodine test positive. But after chewing it went through the mouth that is saliva was applied on it. Saliva separates the carbohydrates present in food. So the test was negative later.

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Answer 2

Answer:

Because digestion of starch takes place in mouth due to presence of an ptyalin enzyme that is why when slice is chewed it does not give blue black colour.