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How should the amount of water be kept while testing the effect of light on a plant?

Answer and explanation

Correct answer: It should be kept the same

The direct answer is C, the amount of water should be kept the same. To test only the effect of light, light must be the independent variable, while water, plant type, soil, pot size, and observation time should be controlled. If one plant receives more water than another, a growth difference could be caused by water rather than light, so the conclusion would be unreliable. Option A is wrong because changing water introduces another variable. Option B is wrong because water must be measured or controlled so the comparison is fair. Option C is correct because equal water removes that competing explanation. Option D is wrong because doubling water deliberately changes a second factor and does not test light alone. A useful exam method is to ask, “Which factors must stay constant so only the chosen factor changes?” Those are controlled variables.

Related tags

WaterControlled-VariableLightFair-TestVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScience

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