Spontaneous Generation - Biology 11

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Spontaneous Generation - hypothesis (disproven) stating that life could arise from non-living matter.

Controlled Experiment - a test of the effect of a single variable by changing it while keeping all other variables the same

Manipulated Variable - An independent variable that is manipulated to achieve a particular effect or tested to determine if it is the cause of the effect.

Responding Variable - factor in an experiment that a scientist wants to observe, which may change in response to the manipulated variable; also known as a dependant variable.

Whenever possible, a hypothesis should be tested by an experiment in which only one variable is changed at a time. All other variables should be kept unchanged, or controlled. This type of experiment is called a controlled experiment. The variable that is deliberately changed is called the manipulated variable. The variable that is observed and that changes in response to the manipulated variable is called the responding variable.