14. • Making curd and Bread
• Medicinal use of
Microorganism
• Increasing Soil Fertility
• Cleaning the
Environment
• Vaccine
• commercial production
of alcohol and wine
15. Yeast is an example of microorganism. It is a
fungus. It is used to make bread. There are air
spaces in the bread. The air spaces are caused
by carbon dioxide gas given out whenthe
yeast acts on the dough. This shows that
microorganisms breath.
19. Harmful microorganisms can cause
disease
Some disease can easily spread from one
person to another. They are called contagious
diseases. Examples are influenza, measles,
mumps and chicken pox.
20. How do microorganisms spread
from one person to another?
• Through food and drink.
• Sneezing or coughing.
• Direct contact.
• Carried by mosquitoes or flies.
• Microorganisms can also spread through the
air.
21. How to prevent disease from
spreading?
• Wash your hands before handling food
especially after using the toilet.
22. Drink water that has been boiled
because boiling kills microorganisms.
23. • Cover your mouth when coughing or sneezing
to prevent microorganisms from spreading
into the air.
24. • Do not share personal items such as
toothbrush, towel and comb.