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Which factor should be kept the same while testing the effect of light on plant growth?

Answer and explanation

Correct answer: Amount of water

When investigating the effect of light, the duration or intensity of light is changed, so it is the independent variable. The amount of water must be the same for all plants because different amounts of water can also affect growth. Measured plant height is the dependent variable, or result. Exam tip: In a fair test, change only one factor and keep the others controlled.

Related tags

Plant GrowthLightControlled VariablesFair TestScientific InvestigationVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary Science

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