PLANT PHYSIOLOGY
PLANT GROWTH
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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TRUE
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FALSE
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Either A or B
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None of the above
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Detailed explanation-1: -To ensure the internal validity of an experiment, you should only change one independent variable at a time.
Detailed explanation-2: -In an experiment, the researcher varies (or manipulates) one or more independent variables. An independent variable must have two or more levels (different values). These levels can reflect either quantitative or qualitative differences in the independent variable.
Detailed explanation-3: -Researchers often include multiple independent variables in their experiments. The most common approach is the factorial design, in which each level of one independent variable is combined with each level of the others to create all possible conditions.
Detailed explanation-4: -Answer and Explanation: You can have as many independent variables in an experiment, as you want, but you would like to design your experiments to have only one independent variable if it is possible. This is because it allows you to determine whether your independent variable influences your dependent variable.