Page 55 - Genius Kidz Prudence Learning Sc-8

Cytoplasm Robert Hooke made his observation by using
an instrument called microscope.

Pilus Jack : Why do we stain the slide before its
visualization ??
S i m p l e ! b e c a u s e d i f fe r e nt
Bacterial
flagellum Capsule component take up the stain and
Ribosomes DNA Plasma Cell wall become visible……
membrane
Shape and size of cells
Unicellular
Discovery of Cell (a) Shape : Cell can be oval, round, elongated,
cylindrical or of several different shapes.
Robert Hooke discovered the Cell shape is influenced by its cytoplasmic

cell in 1665 in cork slices. He viscosity, cell wall rigidity and its function.
s a w h o n e y - c o m b l i k e

compartments in the slice, each Different shapes of different cells are as
shown below:
compartment was called
“Cellular” by him which means
a s m a l l r o o m . E a c h
compartment was later on Light microscope
called a “Cell”.

Amoeba cell White blood cell

Nerve cell Smooth muscle cell

Sperm cell Egg cell
Microscope used by Robert Hooke
Activity 1
Observe the basic components of cell by using a thick onion leaf taken from inside. Using forceps pull away the
thin linning from the inner surface of the leaf. Cleanly cut a small piece of it and put it on a glass slide. Pour a drop
of water on glass slide and add methylene blue solution and place a coverslip on it ensuring that no bubbles are
trapped. Now observe the slide under a microscope. Sketch what you see and label the parts as well.
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