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Download HSEB Notes of Botany | Kingdom Monera | Biology
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Posted By on Wednesday, February 13, 2013 | 2:33 AM

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Bacteria are discovered by Anton Van Leeuwenhoek in 1676. They are found everywhere in air, water, soil, and bodies of organisms. There is no natural death of bacteria. They are killed either using chemicals or by infecting with virus.
Morphology : Size of the bacteria varies from 2-5µm and 0.3-0.8µm width in rod shaped bacteria. In spherical bacteria the size varies from 0.5 – 1µm in diameter. 
Spherical bacteria: the bacteria having spherical in shape are called coccus bacteria. The coccus bacteria may be found singly and freely are called monococcus or micrococcus. When they are found in the group of two is called diploccus. Sometimes they are found in the group of four are called tetracoccus. Some of them are found in chain are called streptococcus and some are found in large group like bunch of grape called staphylococcus.
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