17 Questions
What did Needham observe in his experiment with the cloudy broth?
Numerous microscopic creatures
Why did Spallanzani's heated but sealed flasks remain clear?
No air was allowed to enter the sealed flasks
What concept did Rudolf Virchow introduce to counter spontaneous generation?
Theory of Biogenesis
Why did Louis Pasteur use S-shaped flasks in his experiment?
To prevent airborne contamination
What was a key difference between Needham's and Spallanzani's experiments?
Outcome with sealed flasks
Why did arguments about spontaneous generation persist until Louis Pasteur's experiment?
Lack of scientific evidence supporting biogenesis
Which theory posited that certain types of organisms could arise from non-living matter?
Theory of Abiogenesis
Who conducted an experiment involving meat and maggots that challenged the theory of spontaneous generation?
Francesco Redi
Which scientist's experiment involved boiling broth in flasks and demonstrating that microbes did not arise spontaneously?
Louis Pasteur
Why did people once accept the theory of spontaneous generation as an explanation for certain types of organisms' existence?
Due to the lack of understanding of microorganisms
How did Lazzaro Spallanzani's experiments contribute to challenging the theory of spontaneous generation?
By proving that sealed environments prevent growth of microbes
Who is credited with popularizing the concept of cell theory by stating 'all cells arise from cells'?
Rudolf Virchow
Which scientist observed protozoa in rainwater and bacteria in the human mouth and intestine?
Anton van Leeuwenhoek
What did Francesco Redi's experiment with jars demonstrate regarding the formation of maggots?
Maggots are the offspring of flies, not products of spontaneous generation.
In John Needham's experiment, he boiled broth infused with plant or animal matter to support which theory?
Spontaneous Generation
What was the outcome of Spallanzani's experiment that countered Needham's results?
Boiling broth kills preexisting microbes, preventing spontaneous generation.
'Omnis cellula a cellula' is a phrase associated with which scientist's contribution to cell theory?
Rudolf Virchow
Explore the experiments conducted by Needham and Spallanzani to test the theory of spontaneous generation. Learn about the differences in their methodologies and results.
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