Spontaneous Generation

• Spontaneous Generation


  It states that organisms come from nonliving sources.
• Aristotle's theory stated that life could arise from non-life through the process of "spontaneous generation".
• Cell Theory's Third Postulate

  It contradicts the theory of spontaneous generation.
• Francesco Redi


  1668, he experimented on fresh meat in jars.
• John Needham


  1745, he supported the spontaneous generation by believing that life had been created from non-life.
• Francesco Redi


  He concluded that maggots can only come from something alive.
• Lazzaro Spallanzani


  He was not convinced by the experiment of John Needham.
• Louis Pasteur


  He used s-shaped flasks without a seal, then he boiled the broth to kill any existing microbes.