Page 11 - SCERT Kerala State Syllabus 8th Standard Basic Science Textbooks English Medium Part 1_Neat

Preparation of observation material

Stage 1 Stage 2 Stage 3 Stage 4
Put the material to be Take thin cross sections With a brush, shift the Put the thinnest and
observed in the petridish of the material to be sections to a watch glass complete sections to a
containing water to observed. containing water. watch glass containing
prevent dehydration. stain.

Stage 5 Stage 6 Stage 7 Stage 8
Add one or two drops of Wash the stained section Place a cover glass over Wipe out the excess
glycerin to the slide to in clean water and place the material using a glycerin using tissue
prevent drying up of the it in the glycerin on the needle in such a way that paper.
material. slide. air bubbles do not pass.
Illustration 1.1

Observe the slide you have prepared through a microscope. Try
to understand the difference in the magnification when lenses
10x and 45x are used.

Sample of practical
recording 10x

Aim : Fig. 1.2 45x
Materials required : Recording the findings is as important as conducting
Procedure : practicals in science. Record each stage of the experiment
Observation : following the sample given, in your science diary.
Inference :

10 Basic Science VIII