Boojho took some grains of boiled rice in a test tube ‘A’ and Paheli took boiled and chewed rice in a test tube ‘B’. Both of them poured 1 – 2 drops of iodine solution into the test tube and observed the colour change. What colour change would they have observed? Give reasons for your 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.

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