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A student investigates the effect of light duration on plant growth. The number of light hours received each day is changed. What is the independent variable?

Answer and explanation

Correct answer: Duration of light exposure

The direct answer is B: duration of light exposure. An independent variable is the factor deliberately manipulated by the investigator. Here the student changes the number of light hours received each day, so that is the independent variable. Plant height is a possible dependent variable because it is a growth result that may be measured. Amount of soil and plant species are normally controlled so that they do not create extra differences; therefore C and D are not the changed factor. The reasoning is: choose different daily light durations, keep other conditions comparable, measure growth, and compare results. B is therefore correct. Exam cue: identify the experimental input, not the measured plant response.

Related tags

VariablesIndependent VariablePlant ExperimentVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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