Answer:
Micro-organisms are divided into four major groups which are as follows: (i) Bacteria: These are single celled organisms which are harmful, as they cause disease and some of them may be useful as in vaccines. (ii) Fungi: These are non-green plants which consume their food from the dead organic matter. (iii) Protozoan: These are unicellular animals which cause diseases like malaria and dysentery. (iv) Algae: These are photoautotrophic organisms that may be unicellular or multicellular. They play important role in medicines, agriculture, industry and as food. Viruses are also considered to be micro-organisms but are actually the connecting links between non-living and living organisms.
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