Redi and Pasteur Experiments to disprove the theory of spontaneous generation
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by Kathy Egbert
| 23 Questions
1
1
Last Name First Name
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Class Section
A A1
B A2
C A3
D A4
E A5
F A6
G A7
H A8
Origins of the Scientific Method
Redi's Experiment in 1668 and
Pasteur's Experiment in 1860

For over 2,000 years spontaneous generation was thought to be the process by which organisms came into existence. People thought that frogs arose from the spring mud around ponds (not knowing that frogs hiberated during the winter in the mud) or that rats grew out of hay stacks in their barns. People didn't realize that all organisms are born from other living organisms of their same species until scientists proved that the theory of spontaneous generation was false.

For those that the video didn't load, here is the actual URL and you can try it on your phone or when you are at home: https://www.youtube.com/watch?v=WNByRghR6sw
For those whose chromebook didn't load the video here is the actual URL: https://www.youtube.com/watch?v=WzbHOY5fGqc
3
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Redi's question was simply, "Where do maggots come from?"
True
False
4
1
Redi converted his question into a hypothesis so he could test where flies come from. To use the format:

"If (independent variable)...then..(dependent variable)."

His hypothesis was most likely something like:

If maggots originate from meat, then maggots will be found on the meat under all conditions."
True
False
5
1
Independent Variable:
A number of fly maggots
B flies
C exposure to flies
D the 3 jars
6
1
Dependent Variable:
A number of fly maggots
B flies
C exposure to flies
D the 3 jars
7
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Examples of "controls" in this experiment included: the same style of jars, flies, exposure time, same temperature, light, and surroundings during the experiment
True
False
8
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The "constant" in this experiment was the jar that was closed and sealed from exposure to the flies.
True
False
9
1
Redi had to use a gauze covered jar in his experiment because...
A the gauze allowed air to reach the meat because his critics said that nothing could grow without air.
B the gauze allowed the flies to lay eggs on it instead of the meat.
C the gauze kept the flies from reaching the meat.
D the gauze kept other organisms out of the jar.
10
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Redi's Conclusion: Spontaneous generation was not true. Life comes from other life.
True
False
The supposed development of living organisms from nonliving matter such as maggots from rotting meat was disproved by Redi's experiment. The theory of spontaneous generation for larger organisms that could be seen with the naked eye was easily shown to be false. However, the theory of spontaneous generation was not fully discredited until the mid-19th century with the demonstration of the existence and reproduction of microorganisms, most notably by Louis Pasteur. Pasteur proves that all organisms including microorganisms come from other living organisms.
If the video didn't load automatically for you, here is the actual URL and you can try loading it on your phone or at home: https://www.youtube.com/watch?v=Z7oLUWDeq7w
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Pasteur's Question was probably something like, "What do bacteria which can't be seen with the naked eye grow from?"
True
False
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Pasteur's Hypothesis was something like: If bacteria grow from the sterilized broth, then they will grow in any condition.
True
False
13
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Independent Variable: exposure to the microorganisms in the air
True
False
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Dependent Variable: growth of microorganisms in the broth
True
False
15
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Constants in this experiment included the sterlized broth.
True
False
16
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The word "sterlized" means that the broth was heated enough to kill all organisms living in it.
True
False
17
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The clever use of the swan-neck flask allowed Pasteur to let microorganisms enter the flask, but not air.
True
False
18
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Pasteur's conclusion was that all life, including microorganisms not seen by the naked eye, grow from other life forms. This conclusively disproved the theory of spontaneous generation.
True
False
19
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Give an example of how "pasteurization" has improved life for us.
Check your understanding of Pasteur's experiment by going to the textbook website: classzone.com. Select Animated Biology, Unit 1, and view the animation, "Chapter 1 Experimental Design."
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The dependent variable was (type it exactly like what is in the animation):
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The independent variable was (type it exactly like what is in the animation);
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Control (type it exactly like what is in the animation):
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Constant (type it exactly like what is in the animation):
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