in this post, you will learn about activity 6.3 NCERT class 10 science Life Processes which belongs to chapter 6 NCERT solutions. You can also go through activity 6.2 class 10science life process.
Explain Activity 6.3 NCERT Class 10 Science Life Processes
Activity 6.3 Class 10 Science NCERT
Object: Action of saliva on the starch present in food
Material Required:
Two test tubes, pipette, 1% starch solution, saliva, iodine solution.
Procedure: (i) Take 1 ml.
of 1% starch solution in each of two test tubes (A and B)
(ii) Add 1 ml. of saliva to test tube A and leave
both the tests tubes undisturbed or 20-30 minutes.
(iii) Now add a few drops of dilute iodine solution
in both of the test tubes.
Observation:
Starch solution of test tube A does not show any colour change. It remains pale
yellowish due to the colour of the iodine solution, while a starch solution of test
tube B turns blue-black.
Inference: We know that
starch gives a blue-black colour with iodine solution. In test-tube B there was
starch solution hence it gave a blue-black colour.
In test-tube A colour remains
unchanged. It means that starch is no longer present in this tube.
Actually, the starch of test tube A is
converted into maltose by the action of salivary amylase present in saliva.
Maltose does not give a blue-black colour with iodine solution.
So now you can understand activity 6.3 Class 10 Science
NCERT, for the better practice you can also read NCERT solutions of class 10 Science chapter 6 life processes.
Related Topics –
1. previous activity –
2. Next activity - Activity 6.4
3. Solution of Chapter 6 Life Processes
4. MCQof chapter 6 Life Processes
5. Extraquestions of chapter 6 Life Processes
Frequently asked questions
Q. What is the conclusion of activity 6.3 class 10 science?
Ans. When starch present in the food comes in contact with saliva, it gets converted into maltose which does not give a blue-black
colour with iodine solutions.
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