Microorganisms, including fungi, bacteria, protozoa, viruses, and algae, can be both harmful and useful. They play vital roles in various applications, such as food production and soil fertility, but can also cause diseases in humans and other organisms. The document outlines specific examples of beneficial uses and harmful effects for each type of microorganism.

1. Science Presentation
Tahreem zahra

2. TOPIC
Harmful & Useful Microorganisms

3. INTRODUCTION
We all know microorganisms
live in soil, water and even
inside our body but some
microorganisms are useful in
our daily life and some are
harmful.

4. Microorganisms
1. Fungi
2. Bacteria
3. Protozoa
4. Viruses
5. Algae
Here are some types of
microorganisms that
cause diseases in human
beings, animals, and
plants which can even
lead to death. These are
harmful as well as useful
in our daily life.

5. Fungi
O Fungi are an important
source of food. It is
important in bakeries as it
is used in the making of
bread
O It is also used in making
antibiotics
O Fungi can cause a variety
of conditions. Most of
them affect the nails or
skin, causing rashes or
other skin conditions, but
some can cause more
serious infections.
O Some types of diseases
cause by fungi in human
bodies are:
Yeast infection
Fungal eye infection
Ring worm
USEFUL HARMFUL

6. Bacteria
O Bacteria is useful
because it is used in
making yogurt and
cheese
USEFUL HARMFUL
O Infections caused by
bacteria can make us ill.
They reproduce quickly
in our body.
O Some types of bacteria
can cause diseases in
humans, such as
cholera, tuberculosis
(TB), typhoid, etc.

7. Protozoa
O Protozoa play
an important role in
mineralizing
nutrients, making
them available for use
by plants and other
soil organisms.
Protozoa improve the
fertility of soil
USEFUL HARMFUL
O Protozoan infections are
responsible for diseases
that affect many different
types of organisms,
including plants and
animals. They also affect us
from diseases. Some types
of protozoa diseases are:
1. Malaria
2. Giardia

8. Viruses
O We can use Virus to
kill cancer cells
USEFUL HARMFUL
O Viruses can kill, damage,
or change the cells and
make us sick. Different
viruses attack certain cells
in our body such as our
liver, respiratory system, or
blood. Some types of
Viruses diseases are:
1. Corona
2. Chicken pox
3. Small pox
4. Measles

9. Algae
O Algae have various
beneficial aspects as
they are source of food,
they have utilization in
industry, minerals, and
also act as primary
producers and Algae is
also used as a fertilizer.
USEFUL HARMFUL
O There are thousands of
species of algae But only
a few of these produce
toxins or have other
harmful effects.
O Blue-green algae
produce toxins that can
make people and animals
sick.