Question

8. Some saliva was mixed with water and placed in a test-tube labelled A to which some boiled, cooled starch was added. Two other test-tube B and C were prepared as follows: Test-tube B-water and saliva Test-tube C water and starch. The three test-tube placed in water bah at 37°C and allowed to stand in the water for 5 minutes. A few drops were removed from each test-tube with a piece of glass tubing and tested with iodine solution and Benedict's solution. (a) Which of the test-tubes contained a solution that gave an orange precipitate with Benedict's solution? (1 mark)​

Answer 1

Step-by-step explanation:

Solution:

Experiment:

Boiled potato is used here in mashed form and separated into three parts.

Separate them in test tube A, test tube B and test tube C.

In the test tube A, iodine is added.

In the test tube B, iodine is added and then saliva is introduced.

In test tube C, nothing is added and kept as the control set.

Observation:

​The test tube A, the iodine solution changes the boiled potato to blue color.

In the test tube B, saliva is introduced and mixed with the sample after adding iodine.

As a result, the color change will be observed when starch will be broken down to simple sugars like maltose.

The blue color starts reducing in the test tube B as the saliva containing the salivary amylase starts acting on the starch.

Test tube C shows no color change.

Inference:

The change in the test tube containing saliva shows the effect of salivary enzymes like salivary amylase on the boiled starch present in potato. ​

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