Question

suggest an experiment to explain the effect of saliva on starch

Answer 1

Take 10 g of boiled rice in a 100 ml beaker and add 30 ml of water in it. Stir the mixture with a glass rod. Take some amount of this mixture in a test tube and add few drops of iodine solution to it. The colour of the solution becomes blue. It shows that rice contains starch. Take the remaining solution in the two test tubes. Add some amount of fresh saliva from your mouth in the test tube. Keep the test tube at 37°C to get better results. Observe the impact of enzyme present in the saliva on starch solution.

Test the solution in the test tube for starch and sugar by adding iodine solution and Benedict’s solution respectively. We observe that starch has been converted into sugar by saliva because it gives positive effect with Benedict’s solution.




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Answer 2

Aim of the experiment: To study the effect of saliva in food.

Materials required: Boiled rice, water, test tubes, dropper, water bath and Bendict's reagent

Procedure:-

• Take two test tubes and label them as 'A' and 'B'.
• Put one teaspoon of boiled rice in test tube A and one teaspoon of boiled rice in teaspoon B.
• Add 3-4m of water to each of the test tubes.
• Use a dropper to add 3-4 drops of Bendict's reagent to both of the test tubes.
• Heat the test tubes in a water bath and leave it for 10 minutes.

Observation:- In test tube A, there is no colour change of the solution. In test tube B, the colour of the solution changes to brick red.

Conclusion:- Bendict's reagent turns brick red if sugar is present in the solution. As saliva breaks down the starch present in the food into simple sugars (maltose), the test for the sugar is positive in test tube B.