Question

Take two test tubes. Label them A and B. In test tube A put one teaspoonful of boiled rice and in test tube keep one teaspoonful of boiled rice after chewing it for 3 to 5 minutes. Add 3-4 ml of water in both the test tubes. Now, pour 2-3 drops of iodine solution in each test tube and observe. Why there is a change in colour in the test tubes?​

Answer 1

ANSWER

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.

Answer 2

Answer:

Here

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 color of iodine will not change.