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If an experiment tests the effect of light on plant growth what will be the independent variable?

Answer and explanation

Correct answer: Amount of light

The independent variable is the factor that the investigator deliberately changes to study its effect. The dependent variable is then measured to see what happens. In this investigation, the question asks how light affects plant growth. Therefore, different amounts or durations of light may be given to plants, while plant height or another growth measure is recorded. Conditions such as plant type, soil, water, and container should normally be kept as similar as possible so the comparison is fair.

Option D is correct because the amount of light is the factor being changed. Option A, plant height, is the likely dependent variable because it is the outcome measured after the light conditions are changed. Options B and C may be controlled variables if they are kept constant, but they are not the factor named for investigation. Thus the independent variable is the amount of light.

Related tags

ScienceIndependent-VariablePlant-ExperimentNature And Meaning Of ScienceExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceClass 9 Mcq

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