Question

activity ti show that saliva acts on the starch

Answer 1

Materials required for this activity : boiled rice, test tube, iodine solution
Procedure
1.take a small amount of rice and chew it in the mouth till the rice becomes soft.
2. Remove the chewed rice in a test tube.
3. Take another handful of unchewed rice and put it in another test tube. Add few drops of water to both the test tubes
4. Add iodine solution to both the test tubes anshul shake it well
5. After a few minutes observe the change in the colour of the rice in both test tubes.
Conclusion :
The test tube having chewed rice will have its no colour change because it does not contain starch as it was broken in simpler sugars while the other test tube will have the colour changed into blue black as it still contains starch

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Answer 2

Explanation:

To show that saliva acts on starch: -

Take 10 g of cornflour ina beaker. Add about 20 ml of water to it and make a mixture. Take 5 ml of this mixture in a test tube. Add 1-2 drops of iodine to it. The mixture becomes blue-black in colour. This shows the presence of starch.

Take 10 ml of cornflour mixture in another test tube. Add 2 ml of saliva to it and shake well. Divide this mixture into two test tube. In one test tube add a few drops of iodine. No blue-black colour is seen. In the other tube add Benedict's solution and heat. A reddish brown colour is observed. This shows that the starch present in the cornflour has been converted to sugar.