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Which factor is appropriate to control while testing the effect of sound?

Answer and explanation

Correct answer: Duration of light

The direct answer is C: duration of light. When testing how sound affects plant growth, sound intensity is the intended independent variable, and height gain is a possible dependent result. Light also affects photosynthesis and growth, so every group should receive the same amount and duration of light. Otherwise a growth difference might be due to different lighting rather than sound. A is wrong because sound intensity is the factor being tested. B is the measured growth outcome, not a control. D is a calculated result, not a condition controlled during the experiment. The question says duration, and equal light duration helps make the comparison fair. Exam cue: control other growth factors.

Related tags

Light-DurationControlled-VariableSoundPlantVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScience

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