Question

Boojho took some grains of boiled rice in test tube ‘A’ and Paheli took boiled and chewed rice in 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.

Answer 1

Answer:Tube A and Tube B turns dark blue color.

Explanation:

The presence of starch turns the solution in the test tube into blue color in the boiled rice.

After adding iodine to it the color never changes as the activity of salivary amylase on starch.

The conversion of starch present in salivary amylase into maltose gives a negative reaction.

Thus, the color change is prominently noted. In other reactions, this color difference is not seen much.