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  • Microorganisms are not visible to the naked eye.
  • They can live in all kinds of environment, ranging from ice cold climate to hot springs and deserts to marshy lands.
  • Microorganisms are found in air, water and in the bodies of plants and animals. They may be unicellular or multicellular.
  • Microorganisms include bacteria, fungi, protozoa and some algae.
  • Viruses reproduce only inside the host organism, bacterium, plant or animal cell.
  • Some microorganisms are useful for commercial production of medicines and alcohol.
  • Some microorganisms decompose the organic waste and dead plants and animals into simple substances and clean up the environment.
  • Protozoans cause serious diseases like dysentery and malaria.
  • Some micro-organisms grow on our food and cause food poisoning.
  • Root-nodule bacteria of legumes can fix nitrogen from air into soil and increase the soil fertility.
  • Some bacteria and blue green algae present in the soil fix nitrogen from the atmosphere and convert into nitrogenous compounds
  • Certain bacteria convert compounds of nitrogen present in the soil into nitrogen gas which is released to the atmosphere.                 

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