NCERT Exemplar Solutions Class 7 Science Solutions for Nutrition in Animals - Exercise in Chapter 2 - Nutrition in Animals

Question 42 Nutrition in Animals - Exercise

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.


In test tube A colour of iodine changes to blue- black because of reaction of iodine with starch. In testtube B colour will not change because salivary amylase acts on starch while chewing reducing it to simpler sugars.

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