Page 25 - SCERT Kerala State Syllabus 8th Standard Basic Science Textbooks English Medium Part 1_Neat

From a single cell !

Our body is developed from a single cell called zygote. The zygote
undergoes continuous divisions and forms the foetus consisting cells of
different shape, size and content. Foetal cells gradually attain change in
structure and function. This process is known as cell differentiation.

Nerve cells

Bone cells

Blood cells

Zygote Muscle cells
(undifferentiated cell)
Foetal cells
(completely
(partially differentiated cells)
differentiated cells)

Nn{Xw 2.2
Illustration 2.2

Indicators

Formation of foetus.
Significance of cell differentiation.
Write down the consolidaton of the discussion in the science diary.

A giant leap in stem cell
research
What are these
stem cells? Science has succeeded in artificially
developing tissues from stem cells. A lot of
Are they the cells research has gone into this achievement,
which would become a milestone in the field
within seeds? of medicine.

Have you noticed Sneha's doubt about the newsclipping?
What is the reason for the immense popularity gained by stem
cells?
Have a discussion on the description given below on the basis of
the indicators.

24 Basic Science VIII