Spontaneous Generation | biogenesis

 Spontaneous Generation

  • From earliest times, people had believed in spontaneous generation— that living organisms could develop from nonliving matter.
  •  This view finally was challenged by the Italian physician Francesco Redi (1626–1697), who carried out a series of experiments on decaying meat and its ability to produce maggots spontaneously.

Experiment  

 
  1. In his experiment he used covered and uncovered containers of meat, Redi clearly demonstrated that the generation of maggots by decaying meat resulted from the presence of fly eggs, and meat did not spontaneously generate maggots, as previously believed.
  2.              The container which is remain in uncovered condition ,it's produces maggots on the decaying meat because the meat is remain in direct contact with he air.that is why it is contaminated with the flying eggs.
  3.            The container which is remain covered with the cotton,don't produces any maggots,because of it don't contaminated with with the flying object of air.
  4.            later Pasteur experimentally proved this spontaneous generation theory,that living organisms are produces from the living matter.

Biogenesis

  • The hypothesis that living matter arises only from other living matter.
  •  The term biogenesis was coined by Henry Charlton Bastian to mean the generation of a life form from nonliving materials, however, Thomas Henry Huxley chose the term abiogenesis and redefined biogenesis for life arising from preexisting life. The generation of life from non-living material is called abiogenesis.

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