Microorganisms Around Us

Topic Content:

Microorganisms are minute living organisms that are not visible to the naked eye but can be seen with the aid of a microscope.

Microorganisms include:

• bacteria
• viruses
• some fungi
• protozoa
• and some algae

Microorganisms are found almost everywhere in nature. They are found in air, water, surfaces of objects, and living organisms, within living organisms where they are able to invade living cells.

Many microorganisms are disease-causing agents known as pathogens, while some are especially beneficial to man.

a. Microorganisms in Air:

Microorganisms occur in dust and water droplets. They produce spores that are light and can be readily