Defination: unicellular or acellular, eukaryotic and commonly motile organisms are called protozoa. History:1.Leeuwenhock(1676)first gave preliminary accounts of some protozoan forms after the discovery of microscope. 2.Goldfuss(1818)coined the term protozoa but he included many non-protozoan forms under protozoa. 3.von siebold(1845) recognised the unicellular nature of the protozoa and established the term protozoa in its true sense. General characteristics features:. 1.Protozoans are usually microscopic and unicellular individuals. They exhibit all types of symmetry. 2.Most species occur as single but many are colonial. 3.Body is bounded by a cell membrane or plasmalemma. Body may be
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