Page 5 - HA 3

1. Note how long it takes for the lime water to turn milky when we blow in it?

…………………………………………………………………………………………….

……………………………………………………………………………………………
2. Note how long it takes for this lime water to turn milky when we blow air
through the syringe?

………………………………………………………………………………………………

…………………………………………………………………………………………….

3. What does this tell us about the amount of carbon dioxide in the air that we
breathe out?

………………………………………………………………………………………………

………………………………………………………………………………………………

4. How is this CO 2 produced inside our body?

………………………………………………………………………………………………

………………………………………………………………………………………………
5. Where does this process occur? Write the equation for the above process.

………………………………………………………………………………………………
………………………………………………………………………………………………

Activity---6.5(NCERT)

Aim: -To show that CO 2 is produced during Alcoholic Fermentation

Materials Required:
Yeast, some fruit juice or sugar solution, two test tubes, one holed cork, bent glass
tube, freshly prepared lime water.

How to proceed:

1. Take some fruit juice or sugar solution and add some yeast to this.

2. Take this mixture in a test tube fitted with a one-holed cork.

3. Fit the cork with a bent glass tube.

4. Dip the free end of the glass tube into a test tube containing freshly prepared
lime water.