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A student tests plant growth at three light levels. What do the three light levels represent?

Answer and explanation

Correct answer: Different values of the independent variable

The governing concept is that an independent variable can be tested at more than one level. In this investigation, the student deliberately changes the amount or intensity of light, so light is the independent variable. The three light levels are three different values or conditions of that same variable, such as low, medium and high intensity. Plant growth is the response measured, making it the dependent variable. Therefore option C is correct. The levels are not automatically three control groups, because a control group normally provides a comparison condition, and they are certainly not conclusions, which are formed only after analysing results.

Related tags

Independent-Variable-LevelsLightPlant-GrowthExperimental-DesignVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScience

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