(a) Some draw backs of two-kingdom classification ultimately lead to five kingdom classification .List theses with examples.
(b) List four factors based one which Robert H Whittaker (1969) gave five kingdom classification

Answer

(a) (i) Certain unicellular organisms were identified which did not strictly fit either into plant or animal kingdom. For example Euglena has some of both plants and animals .
(ii) Viruses belong to neither plant kingdom nor animal kingdom. Based on this discovery. Ernst Haeckel established third kingdom Protista
(iii) Later, taxonomic as well as morphological and physiological studies indicated significant differences among the protists which lead Copeland to create kingdom Monera for prokaryotic organisms
(b) Whittaker has based his five kingdom classification on following four factors :
(i) Complexity of cell structure (ii) Body organization (iii) Mode and source of nutrition (iv)Phylogenetic relationship .