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Spontaneous Generation

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Katie Mayfield

on 4 January 2013

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Transcript of Spontaneous Generation

By: Katie Mayfield Spontaneous Generation Spontaneous generation is the idea that non-living objects produce living organisms. 4th Century B.C. --> Spontaneous Generation Theory Develops Observations: Maggots came out of meat

Soup created bacteria

Muddy soil produces frogs Observations cont. : Moldy grain produces mice

Sewage and garbage creates rats Scientists Involved with Spontaneous Generation: Francesco Redi- An Italian physician in 1668 who experimented with flies, maggots, and meat. Francesco Redi disproved the theory of spontaneous generation. Redi experimented with maggots and meat only to discover it was the flies around the meat that produced the maggots. Many people say Redi's experiment was one of the first experiments containing the scientific method. John Needham: John Needham- Experimented with various types of soup exposed to air. He believed in the spontaneous generation. The people could not explain what was happening, so they used their data and inferred. John Needham- A Scottish clergyman and naturalist from 1745-1748. Lazzaro Spallanzani- An Italian abbot and biologist from 1765-1767. Spallanzani tested many Needham experiments to disprove the theory of spontaneous generation. Louis Pasteur- A scientist who won the prize for settling Needham and Spallanzani's argument about spontaneous generation. Louis Pasteur- Won the Paris Academy of Sciences prize for settling the argument between Needham and Spallanzani about spontaneous generation. Pasteur proved that spontaneous generation did not exist. Louis Pasteur: Biogenesis and Abiogenesis: Biogenesis: The production of new living organisms or organelles. Abiogenesis: The idea that life arose from inorganic matter. Is spontaneous generation an accurate theory? Yes, I believe spontaneous generation is an accurate theory. I believe this because the people inferred this theory based on data and observations. The people then used their data and knowledge to try to figure out what was happening. Was the theory of spontaneous generation ever disproved? Yes, the spontaneous generation theory was disproved. Each time a scientist did an experiment testing the theory, the theory was always proven wrong. Eventually, enough scientists proved the theory wrong, and spontaneous generation no longer existed. How does spontaneous generation relate to cell theory, characteristics of life, and the scientific method? Spontaneous generation does not follow the cell theory. Spontaneous generation states that non- living things produce living things. The cell theory says that all cells come from pre-existing cells. Also, spontaneous generation does not support the six characteristics of life. The people in the 4th century used the scientific method to come up with the spontaneous generation theory. Francesco Redi: Lazzaro Spallanzani: Lazzaro Spallanzani tested many of Needham's soup experiments to disprove the theory of spontaneous generation. Spallanzani tried many different methods of sterilizing the soup, but each method would result in bacteria in the soup. Spallanzani came to the conclusion that the air polluted the soup with bacteria, not the soup producing bacteria. Lazzaro Spallanzani and John Needham got into an argument about whether the spontaneous generation theory was true or false. The fight got so out of control, the Paris Academy of Science offered a prize for any scientist to resolve the conflict with an experiment. In Summary: In the 4th century, people came up with the theory of spontaneous generation. This meant that non- living things produce living things. There were many scientists who tried to prove or disprove this theory. Eventually, the theory was disproved.
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