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If the hypothesis states that plant growth will increase with more light what is the independent variable?

Answer and explanation

Correct answer: Amount of light

The independent variable is the factor that the investigator deliberately changes to test its effect. In this hypothesis, the proposed cause is the amount of light: the experiment asks whether giving a plant more or less light changes its growth. Therefore, amount of light is the independent variable.

Plant height and number of leaves are possible measurements of growth, so they could be dependent variables, because they may respond to the light conditions. The amount of soil is a condition that should normally be kept constant if it is not being tested. Thus option A is correct. A useful rule is to ask, “What am I changing on purpose?” The answer identifies the independent variable.

Related tags

HypothesisIndependent VariableLightPlant GrowthHypothesis And ExperimentationExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScience

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