Microorganisms are tiny living things that can only be seen under a microscope. They include bacteria, algae, fungi, protozoa, and viruses. Microorganisms can be either unicellular or multicellular. They are commonly found in soil, water, and air. Microorganisms have many important uses such as in medicine, increasing soil fertility, cleaning the environment, producing vaccines, and making commercial products like alcohol. Yeast is an example of a microorganism used to make bread by producing carbon dioxide that creates air pockets in the dough. Harmful microorganisms can cause contagious diseases that easily spread between people through various means such as food, sneezing, direct contact, insects

1. Made By : ADITYA KUMAR SINGH
Class : 8th ‘A’ [E.M]
Micro-Organism

2. An Microorganism which
cannot be seen by naked
eye it only can be seen by
microscope is called
microorganism

3. • Bacteria
• Algae
• Fungi
• Protozoa
• Viruses

4. • Unicellular
• Air,Water And Soil
• Simple in Structure
Rod Shape
Shape Spherical
Spiral

5.  Unicelluler or multicellular
 It is present in moist soil like
Rock, Soil
 They have cell wall, chloroplast

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

12. 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.

15. 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.

16. 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.

17. How to prevent disease from
spreading?
• Wash your hands before handling
food especially after using the
toilet.

18. Drink water that has been boiled
because boiling kills
microorganisms.

19. • Cover your mouth when coughing
or sneezing to prevent
microorganisms from spreading
into the air.

20. • Do not share personal items
such as toothbrush, towel and
comb.