Spontaneous Generation Experiment Comparison
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Questions and Answers

What did Needham observe in his experiment with the cloudy broth?

  • Clear liquid without any signs of growth
  • Large visible organisms
  • Numerous microscopic creatures (correct)
  • No changes in the broth
  • Why did Spallanzani's heated but sealed flasks remain clear?

  • The flasks were not heated properly
  • No air was allowed to enter the sealed flasks (correct)
  • Spallanzani contaminated the flasks
  • The flasks were opened to the air after heating
  • What concept did Rudolf Virchow introduce to counter spontaneous generation?

  • Organisms can emerge from non-living matter
  • Theory of Biogenesis (correct)
  • Spontaneous generation is the only source of new organisms
  • Spontaneous generation is possible under controlled conditions
  • Why did Louis Pasteur use S-shaped flasks in his experiment?

    <p>To prevent airborne contamination</p> Signup and view all the answers

    What was a key difference between Needham's and Spallanzani's experiments?

    <p>Outcome with sealed flasks</p> Signup and view all the answers

    Why did arguments about spontaneous generation persist until Louis Pasteur's experiment?

    <p>Lack of scientific evidence supporting biogenesis</p> Signup and view all the answers

    Which theory posited that certain types of organisms could arise from non-living matter?

    <p>Theory of Abiogenesis</p> Signup and view all the answers

    Who conducted an experiment involving meat and maggots that challenged the theory of spontaneous generation?

    <p>Francesco Redi</p> Signup and view all the answers

    Which scientist's experiment involved boiling broth in flasks and demonstrating that microbes did not arise spontaneously?

    <p>Louis Pasteur</p> Signup and view all the answers

    Why did people once accept the theory of spontaneous generation as an explanation for certain types of organisms' existence?

    <p>Due to the lack of understanding of microorganisms</p> Signup and view all the answers

    How did Lazzaro Spallanzani's experiments contribute to challenging the theory of spontaneous generation?

    <p>By proving that sealed environments prevent growth of microbes</p> Signup and view all the answers

    Who is credited with popularizing the concept of cell theory by stating 'all cells arise from cells'?

    <p>Rudolf Virchow</p> Signup and view all the answers

    Which scientist observed protozoa in rainwater and bacteria in the human mouth and intestine?

    <p>Anton van Leeuwenhoek</p> Signup and view all the answers

    What did Francesco Redi's experiment with jars demonstrate regarding the formation of maggots?

    <p>Maggots are the offspring of flies, not products of spontaneous generation.</p> Signup and view all the answers

    In John Needham's experiment, he boiled broth infused with plant or animal matter to support which theory?

    <p>Spontaneous Generation</p> Signup and view all the answers

    What was the outcome of Spallanzani's experiment that countered Needham's results?

    <p>Boiling broth kills preexisting microbes, preventing spontaneous generation.</p> Signup and view all the answers

    'Omnis cellula a cellula' is a phrase associated with which scientist's contribution to cell theory?

    <p>Rudolf Virchow</p> Signup and view all the answers

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