Define Micro-organisms in biology

Updated on April 8, 2021 09:36 PM IST by Lakshmi Arya

Micro-organisms are very tiny living organisms that exist as unicellular, multicellular, or cell clusters. They are so small that we need a microscope to see them, that’s why they are called microbes or micro-organisms.

Micro-organisms are of four types:

  1. Bacteria
  2. Fungi
  3. Protozoa
  4. Algae
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