Biological Classification – Notes
Biological Classification System
The first classifications were made to identify organisms that were useful to man for food, shelter and clothing.
Aristotle devised the first scientific method of classification.
Later, Carl Linnaeus came up with the two kingdom system of classification.
All plants were put in the Kingdom Plantae while all animals were put in the Kingdom Animalia.
In 1996, RR.H.Whittaker proposed a Five Kingdom Classification system. Three more kingdoms: Moners, Protista and Fungi were added to the existing kingdoms of Plantae and Animalia.
The main criteria that Whittaker used for this classification system were cell structure, thallus organisation, mode of nutrition, reproduction and phylogenetic relationships.
Bacteria are the sole members of Kingdom Monera.
Different bacteria synthesise their food in different ways.