Question

1ml of very dilute starch solution (1% starch solution) is taken in a test - tube and 1ml of saliva is added to it . After keeping this mixture for half an hour, a few drops of dilute iodine solution are added to the test - tube. There is no change in colour on adding iodine solution. What does this tell you about the action of saliva on starch?

Answer 1

Answer:

take 1 ml of starch solution in two test tubes A and B. Add 1ml saliva to the test tube A and leave both test tubes undisturbed for 20 to 30 minutes now add a few drops of delute iodine solution to the test tubes. In which test tube you will observe a colour change. what does this tell about the action of the saliva on the starch