When we get one by one, they can not be seen with our naked eye.
Micro-organismss are categorised into five main groups.
( Bacteria, algae, Fungi, Protozoa, Virus )
BACTERIA
* Unicellular organisms.
* Possess a cell wall.
* Some groups are autotrophic while others are hetertrophic..
* Reproduction of bacteria mainly takes place by fission.
* Can be divded into four main groups based on the shape.
• Cocci - Round and spherical
• Bacilli - Rod shaped
• Spirilli - Spiral shaped
• Vibrio - Comma shaped
ALGAE
* Some algae are unicellular while others are multicellular..
* Most of the algae are aquatic.
* They are autotrophic organisms.
FUNGI
* Some fungi are unicellular while others are multicellular..
* Cell wall is made-up of chitin..
* They are heterotrophic organisms.
* Most of the fungi are decomposers while others are parasitic.
PROTOZOA
* Unicellular organisms.
* Do not possess cell wall.
* They are heterotrophic organisms.
* Use several methods for locomotion. ( Eg: False feet
- Amoeba, Cilia - Paramaeciam, Flagella - Euglena)
VIRUS
* Characteristics between living and non living.
* Contain only DNA or RNA in a protein coat .
* The only life function is reproduction.
* Reproduction is done only inside a host living cell.
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