Page 4 - HA

6 To prepare a mount of human cheek cell, the sample is collected from
a. outer side of cheek with a blade
b. inner side of cheek with a blade
c. outer side of cheek with a toothpick
d. inner side of cheek with a toothpick.

CLASSROOM ACTIVITY-2

Activity---5.3 NCERT

Aim-To study the process of osmosis using egg.
Materials Required:

Glass beaker, two raw eggs, sugar/salt solution, dil. Hydrochloric acid and water.

How to proceed:

Experimental Set-up
1. Keep two eggs in dil. HCl for about one hour to dissolve the shell of the eggs.

2. Wash the de-shelled eggs with water thoroughly.

3. Take two beakers – one half filled with water and the other with saturated
sugar/salt solution.

4. Put one egg in each of the beakers.

5. After about four hours, observe the two de shelled eggs.

Observation:
• The de-shelled egg kept in water looks swollen with increased volume.
• The other de-shelled egg kept in the sugar solution has shrunk in size.