CELL STRUCTURES AND FUNCTION
CELL ORGANELLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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one
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two
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three
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as many as possible
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Detailed explanation-1: -Yes, an experiment should test only one variable at a time. This ensures that the experimental outcome is clearly due to one identifiable factor.
Detailed explanation-2: -A controlled experiment is one in which there is only one independent variable in the experimental group. A controlled experiment is necessary to appropriately test a hypothesis.
Detailed explanation-3: -In a “controlled experiment” only one variable is changed at a time. All other variables should be unchanged or “controlled”.
Detailed explanation-4: -To design a controlled experiment, you need: A testable hypothesis. At least one independent variable that can be precisely manipulated. At least one dependent variable that can be precisely measured.
Detailed explanation-5: -Similar to our example, most experiments have more than one controlled variable. Some people refer to controlled variables as “constant variables.” In the best experiments, the scientist must be able to measure the values for each variable. Weight or mass is an example of a variable that is very easy to measure.