CBSE Class 8 Science Activity Story of Granny

REPRODUCTION IN ANIMALS

Material required:

Yeast Powder, Warm sugar solution (2 spoons of glucose in 50 mL warm water), microscope (with high power), glass slide, coverslip, dropper, forceps.

What to do:

1.Take the warm sugar solution in a test tube and shake well. Add a pinch of yeast powder and shake. Keep in a warm place for 24 hrs. (use a thermocol box).

2.Using a dropper, take one drop of this solution and put it on the glass slide. A drop of methylene blue may be used to stain the yeast for better view. Put a cover glass on the yeast drop and focus under the microscope. Take help of your teacher to focus.

3.Repeat the above mentioned activity after 24 hrs.

Observation :

You will see large number of small oval or round yeast cells at initial stage. After 24 hrs. many in budding stage as shown in the diagram. The buds in the slide may be seen attached to the parent cell. While still on the parent cell, these buds grow and in turn produce buds. Thus a chain of cells are formed. Observe the diagram carefully and then make sketch of your own slide.

Please refer to the link below - CBSE Class 8 Science Activity Story of Granny