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Discuss how classification systems have ...

Discuss how classification systems have undergone several changes over a period of time ?

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Since dawn of civilisation, there have been many attempts to classify the living organisms into two large kingdom: (a) Kingdom Plantae , (b) Kingdom Animalia. This system did not distinguiesh between the eukaryotes and prokaryote, unicellular and multicelluar organisms and photosyntetic ( fungi) organisms.
(iii) Haeckel (1866) identified a Kingdom Protista.
(iv) Copland gave Four Kingdom System of classification called Monera, Protia, Metaphyta and Metazoa. (v) Five kingdom System of classification was given by K.H Whittaker (1969). The five kingdom are : Monera, Protisa , Fungi , Plantae and Animalia ( For details consult chapter -2)
Whittaker has not described viruses and lichens. Stanley discussed virus,viroids etc.
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Knowledge Check

  • The classification system have undergone several changes over a period of time, why?

    A
    Because the criteria for classification changed, now they are based to trace the developmental history.
    B
    Because over time an attempt has been made to evolve such classification which are based on phylogeny
    C
    Because over time an attempt has been made to evolve such classification system which are based only on human evolution mainly
    D
    Because over time an attempt has been made to evolve such system which are based on histological and cytological studies

  • Assertion: Classification systems have undergoes several changes over a period of time. Reason: This happened, because the criteria for classification get changed gradually.

    A
    If both assertion and Reason are true and the reason is a correct explanation of the assertion.
    B
    If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion.
    C
    If Assertion is True but the Reason is False.
    D
    If both Assertion and Reason are False.

  • Why are the classification systems changing every now and then ?

    A
    Because the criteria for classification changed
    B
    Because the criteria for our thinking changed
    C
    Because the criteria for our life style changed
    D
    Because the criteria for our feeding style changed

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