module 1: the development of cell theories

• divine creation theory- the theory of special creation proposes that life on earth is created by a supernatural power, the GOD
• The theory of spontaneous generation or abiogenesis- assumes that non-living material in a spontaneous manner gives rise to life. Several observations are supporting this theory.
• Van Helmont - claimed that he could produce mice from the dirty shirt and handful of wheat grains kept in a dark cupboard in 3 weeks
• Biogenesis Theory - Lazzaro Spallanzani , Francisco Redi , and Louis Pasteur performed well-designed scientific experiments to disprove the theory of spontaneous generations.
• Francesco Redi


  Did not believe that life originated from non-living matter
• Lazzaro Spallanzani


  showed that it is not an inherent feature of matter and that it can be destroyed by an hour of boiling
• Spallanzani's experiment

  1. Placed broth in 2 separate bottles

  2. Boiled the broth in both bottles for a long period at a high temperature

  3. Sealed one bottle and left the other bottle open
• Theory of Catastrophism - was a theory developed

  by Georges Cuvier .This is the extension of the theory of special creation. This theory assumes that life originated by creation and is followed by catastrophe due to geographical disturbances.
• Theory of Cosmozoic


  Theory that life was present in the form of resistant spores and appeared on Earth from another planet
• Theory of Cosmozoic

  • Proposed by Richter and strongly supported by Arrhenius
  • Assumes life was present in the form of resistant spores and appeared on Earth from another planet
  • Since the condition of the Earth was supporting life, these spores grew and evolved into different organisms
• Fossils of microorganisms were found in meteorites in 1961
• Theory of Eternity of Life - This theory assumes that life has no beginning or end. The theory is also known as Steady State Theory.
• lazzaro spallanzani

  
• francesco redi

  
• louis pasteur