|Class 11 Biology Biological Classification||Introduction|
Carolus Linnaeus discovered a two Kingdom system of classification with Plantae and Animalia kingdoms, but this system did not distinguish between the eukaryotes and prokaryotes, unicellular and multicellular organisms, and photosynthetic (green algae) and non-photosynthetic (fungi) organisms.
Fig. Carolus Linnaeus
The main criteria for classification used by Whittaker include cell structure, thallus organisation, mode of nutrition, reproduction and phylogenetic relationships