Page 48 - SCIENCE DLP T6 SK (SEMAKAN 2017)

After conducting the experiments, Chua and his friends shared
their observations.

The circumference of the balloon increased.

I managed to see the protozoa move and change their positions.

The size of the bread mould increased.

From these activities, what conclusions can you make
regarding the life processes of microorganisms?

Factors Affecting the Growth
of Microorganisms

Mr Hadi, why doesn’t the yeast INSTANT YEAST AST
in these packets grow?

The yeast in the packets do not grow because they
are still inactive. Microorganisms will grow when all
the conditions needed for them to grow are met.

What are the conditions needed for microorganisms to grow?
Look at the situation below.
Suitable Temperature

COLD
Father, all the milk in this
supermarket are kept in the cold If milk is stored in a
area at a low temperature. Why? warm area and at
suitable temperature,
microorganisms will
grow and spoil the
milk.

FRESH FRESH FRESH
MILK MILK MILK

Is suitable temperature one of the factors for microorganisms
to grow? Try proving it with an experiment.

40 3.1.4