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Microorganisms : Friend and Foe

  • Microorganism
    • The living organisms that cannot be seen with unaided eye are called microorganisms.
    • The study of microorganisms is called microbiology.
    • They are cosmopolitan in distribution and found everywhere around us.
    • All the tiny organisms around us like in air and soil do not fall into the category of microbes.
    • Antony Van Leewanhoek observed bacteria for the first time using his self built microscope.
  • Microorganisms are classified into four major groups- bacteria, fungi, protozoa and some algae.

Shapes of bacteria:

 Bacteria are of different shapes. They can be classified in four groups based on their shape.

Important Scientists
  • Robert Koch ((1843-1910)
    • Robert Koch developed the germ theory of disease that established the microbial cause of disease.
    • He identified a…

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