Life Processes | Class 10 | Activity 6.3 with Solution

Life Processes | Activities in Text Book with Solution

Activity 6.3

Take 1 mL starch solution (1%) in two test tubes (A and B).

Add 1 mL saliva to test tube A and leave both test tubes undisturbed for 20-30 minutes.

Now add a few drops of dilute iodine solution to the test tubes.

In which test tube do you observe a colour change?

✅ Answer: Test tube B.

What does this indicate about the presence or absence of starch in the two test tubes?

✅ Answer: Test tube A does not contain starch whereas test tube B contains starch.

What does this tell us about the action of saliva on starch?

✅ Answer: On the addition of saliva in starch solution, the starch gets converted into other products such as maltose sugar.

• Activity 6.1
• Activity 6.2
• Activity 6.3
• Activity 6.4
• Activity 6.5
• Activity 6.6
• Activity 6.7
• Activity 6.8

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