Discuss how classification systems have undergone several changes
over a period of time?
The classification systems have undergone several changes with
time. The first attempt of classification was made by Aristotle.
He classified plants as herbs, shrubs, and trees. Animals, on the
other hand, were classified on the basis of presence or absence
of red blood cells. This system of classification failed to
classify all the known organisms.
Therefore, Linnaeus gave a two kingdom system of classification.
It consists of kingdom Plantae and kingdom Animalia. However,
this system did not differentiate between unicellular and
multicellular organisms and between eukaryotes and prokaryotes.
Therefore, there were large numbers of organisms that could not
be classified under the two kingdoms.
To solve these problems, a five kingdom system of classification
was proposed by R.H Whittaker in 1969. On the basis of
characteristics, such as cell structure, mode of nutrition,
presence of cell wall, etc., five kingdoms, Monera, Protista,
Fungi, Plantae, and Animalia were formed.
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