Question

The image shown an experiment set up in which boiled rice was taken in test tube A and boiled and chewed rice was taken in test tube B.when iodine solution is dropped into both the test tube,the colour of water in test tube A changed to blue black,but the colour in test tube B remained unchanged.Give reason


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Answer 1

Answer:

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Explanation:

In test-tube A, the boiled rice contains starch. When we add 1-2 drops of iodine, the combination turns in the shade of blue-black. This indicates the presence of starch in the test tube A.  

In test-tube B, the starch of rice converts into sugar on digestion. Thus, the colour of iodine will not change.