Vocabulary
A well tested explanation that unifies a large range of observations.
What is a theory?
He boiled broth in a special flask with a curved neck claiming that microorganisms do not pass through the neck.
Who was Louis Pasteur?
What is the first step in the scientific method?
observation
When are experiments not possible?
In nature and ethical considerations (people).
The theory that living things come from non-living things.
What is spontaneous generation?
He saw things in pond water through a special lens and called the things he saw “animalcules”.
Who was Anton van Leeuwenhoek?
In the 3rd step, what are the two groups in the controlled experiment?
The control group and variable group.
Can a theory change?
Yes.
The variable that is changed on purpose in an experiment.
What is the manipulated variable?
He let one sealed flask of gravy stand, saw animalcules and said that they spontaneously generated.
Who was John Needham?
How many variables should a scientist test during an experiment?
1
What materials and equipment did Francesco Redi use in his experiment?
Meat, gauze, jars
The variable that is observed and changes in response to another variable.
What is the responding variable?
He tested the theory of spontaneous generation by setting up an experiment with meat in an open container and meat in a covered container.
Who was Francesco Redi?
During the analyzing data step, how should data be represented?
In tables(charts) and graphs.
Who settled the argument of spontaneous generation?
Louis Pasteur
An experiment in which one variable is changed while the other variables are controlled.
What is a controlled experiment?
He boiled two bottles of gravy and left one bottle open and covered the other bottle. After some time, the open bottle contained microorganisms while the covered one did not.
Who was Lazzaro Spallanzani?
Summarizing the experiment, checking if the hypothesis was supported, and possible errors are part of which step?
a conclusion
What is the manipulated variable in this statement?:
Sugar may cause fruit to not turn brown.
Sugar