Microbiology is the study of a variety of living organisms which are invisible to the naked eye like bacteria and fungi and many other microscopic organisms. Although tiny in size these organisms form the basis for all life on earth. These microbes as they are also known to produce the soil in which plants grow and the fix atmospheric gases that both plants animals use. About 3 billion years ago at the time of formation of the earth, microbes were the only lives on earth. Microorganisms have played a key role in the evolution of the planet earth.

Microorganisms affect animals, the environment, the food supply and also the healthcare industry. There are many different areas of microbiology including environmental, veterinary, food, pharmaceutical and medical microbiology, which is the most prominent.

Microorganisms are very important to the environment, human health and the economy. Few have immense beneficial effects without which we could not exist. Others are really harmful, and our effort to overcome their effects tests our understanding and skills. Certain microorganisms can be beneficial or harmful depending on what we require from them.Microbiology

Harmful Microorganisms

Disease and decay are neither inherent properties of organic objects, nor are caused by physical damage, it is microorganisms that bring about these changes. We are surrounded by bacteria, virus, and fungi. Many microorganisms cause diseases in cattle, crops and others are known for entering human bodies and causing various diseases.

Examples of familiar human diseases are:

Bacteria: pneumonia, bacterial dysentery, diphtheria, bubonic plague, meningitis, typhoid, cholera, salmonella, meningococcal

Virus:  Chickenpox, measles, mumps, German measles, colds, warts, cold sores, influenza

Protozoa: amoebic dysentery, malaria,

Fungi: ringworm, athlete’s foot


As decomposers, bacteria and fungi play an important role in an ecosystem. They break down dead or waste organic matter and release inorganic molecules. Green plants take these nutrients which are in turn consumed by animals, and the products of these plants and animals are again broken down by decomposers.

Yeast is a single-celled fungus that lives naturally on the surface of the fruit. It is economically important in bread-making and brewing beer and also in the making of yoghurt.

Most microorganisms are unicellular; if they are multicellular, they lack highly differentiated tissues.

There fundamentally two different types of cells, One being Prokaryotic and the other Eukaryotic

Useful Microorganisms

Microbes especially prokaryotes are numerous in number in comparison to eukaryotes.

The lineage of life on Earth originated from these microbes:




Branches of microbiology

There are various different branches in microbiology and these include the following:

1.Bacteriology- The study of bacteria

2.Mycology –The study of fungi

3.Phycology- The study of photosynthetic eukaryotes. (Algae- Seaweed)

4.Protozoology – The study of protozoa (Single-celled eukaryotes)

5.Virology- The study of viruses, non-cellular particles which parasitize cells.

6.Parasitology- The study of parasites which include pathogenic protozoa certain insects and helminth worms.

7.Nematology- The study of nematodes.

Stay tuned with BYJU’S to learn more about Microbiology and its importance.

Test your knowledge on Microbiology


  1. It is a very good and easy explanation to children. The diagrams are also helpful to be more understandable. Microbes are so tiny and shown in different level of visions under different kinds of microscopes. I think that it will be more effective if the children know which one is seen under which type of microscopes. Thus the chidren might be interested in the microscopes for different kinds of magnification at the beginning of the study of microbiology.

  2. very wonderful

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