Page 7 - Microorganisms

23 Microorganisms

(Figure 2.9). Examples are souring of milk by
bacteria, the growth of mould on bread, and the rotting of fruits and
vegetables by bacteria and fungIinbfoortmha. tion

Microorganisms which cause diseases are called pathogens.

Activity 2.3 Investigate

• Place a wet slice of bread in a Food gets spoiled if not stored
cabinet. properly. Investigate a few ways
of storing food to keep it safe and
• Leave it for a few days and fresh.
then observe.

• Record your observations and
discuss them with your
teacher and classmates.

2.4 Infection Figure 2.10 Infection

The attack of disease-causing
microorganisms in the body of an animal
or plant is called infection (Figure 2.10).
Infectious diseases quickly spread from

Some common infectious diseases

Viral diseases Bacterial diseases Fungal diseases

· Influenza · Food poisoning · Athlete's foot

· Common cold · Pneumonia · Ringworm

· Chicken pox · Typhoid · Rust

· Polio · Cholera · Smut

· Hepatitis · Tuberculosis

· AIDS