Introduction of Microbes

Introduction of Microbes

When you neglect personal hygiene, you are increasing the risk of falling sick. Let us name some of the diseases or conditions caused by microorganism due to the negligence of personal hygiene.

1. Diarrhoea

2. Tooth decay

3. Athlete’s foot( Madurai’s foot)

4. Dandruff.

Do you believe that there are some organisms which you cannot see with your naked eye?

Yes. microbes can not be seen without the help of a microscope.

Most of the microbes belong to four major groups:

* Bacteria

* Virus

* Protozoa

* fungi

1. Bacteria

Bacteria are very small prokaryotic microorganisms.

Bacterial cells do not have nucleus and do not usually have membrane bound organelles.

* Bacteria can exist either as independent organisms or as parasites

* They invade tissues

* They produce pus or harmful wastes

Table: Bacteria diseases

Disease

Disease is a definite pathological process having a characteristic set of signs and symptoms.

Disorder

Disorder is a derangement or abnormality of function.

2. Virus

Virus is an acellular agent that replicates only inside the cells of other living organisms. Virus can infect all types of life forms plant, animals and microorganisms. They invade living normal cells and use their cell machinery to multiply. They can kill damage or change the cells and make you sick.

Diseases Caused By Virus

1. Common cold

2. Influenza

3. Hepatitis

4. Polio

5. Smallpox

6. Chicken pox

7. Measles

Discuss in your class room

“Is virus a living thing or non living thing?”

Microscopes help to study the structure of the microorganisms