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A student gave plants different amounts of light while testing the effect of water amount. What problem is this?

Answer and explanation

Correct answer: An additional factor also changed

The correct answer is that an additional factor also changed. Since the student wanted to test the effect of water amount, all plants should have received the same amount of light. Different light levels can affect plant growth along with water, so the result would not be a fair test. Option B describes the correct experimental condition, but the question states that the light levels were different. Exam tip: when testing one variable, keep all other variables controlled.

Related tags

Fair TestControlled VariablesPlant GrowthWater ExperimentLight IntensityScientific InvestigationHypothesis And ExperimentationExploration: Entering The World Of Secondary Science

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