Microorganisms can be both harmful and useful. Useful microorganisms are used to make curd, bread, medicines, increase soil fertility, clean the environment, produce vaccines, and commercially produce alcohol and wine. While most bacteria are harmless and some are helpful, certain bacteria and viruses can cause diseases like diarrhea, sore throat, and AIDS in humans, plants and animals. Protozoa can also be either harmless or cause harmful diseases like malaria, and fungi such as yeast are useful for producing bread and cake but require a microscope to be seen.

1. Harmful And Useful
Of Microorganism

2. Usage Of
Microorganism

3. • Making curd and Bread
• Medicinal use of
Microorganism
• Increasing Soil Fertility
• Cleaning the
Environment
• Vaccine
• commercial production
of alcohol and wine

4. Harmless Of
Microorganism

5. Bacteria
• Most kind of bacteria
are harmless and many
even helpful.
• Its causes diseases such
as diahoea, sore throat.

7. Virus
• Can infect
human, plants and
animal.
• Virus are responsible
for many serious
diseases and
sometime deadly such
as AIDS.

9. PROTOZOA
• Can be harmless and
harmful.
• Malaria is one diseases
cause by a kind of
protozoa.

11. FUNGI
• Some of them can look
with naked eyes, but some
of them can not.
• Example Yeast was 1 of
the useful microorganism
that we need to use
microscope to look them.
• Yeast can help people to
produce delicious bread
and cake.