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A student asks how the amount of light affects plant growth. What should be changed to investigate this question?

Answer and explanation

Correct answer: Amount of light

The direct answer is B: change the amount of light. The independent variable is the factor deliberately changed to investigate its effect. Here the question asks how light affects plant growth, so light amount is changed while growth is measured as the dependent variable. Other important conditions, such as plant species, soil amount, water, temperature, and pot size, should normally be kept the same so that the comparison is fair. A, C, and D are wrong for this question because changing plant species, soil amount, or pot size would introduce other possible causes; they are controls, not the intended variable. B is correct because it directly tests the stated cause. Memory cue: independent variable is what I change; dependent variable is what I measure.

Related tags

Independent VariablePlant GrowthLightInvestigationScientific Questions And ObservationsExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScience

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