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If plants exposed to louder sound also receive more fertiliser what will fertiliser amount be called?

Answer and explanation

Correct answer: Confounding variable

The amount of fertiliser can affect plant growth. If plants exposed to louder sound also receive more fertiliser, any change in growth could be due to sound or to fertiliser. Therefore, fertiliser amount is a confounding variable, not a controlled variable; a controlled variable must be kept the same in all groups. Exam tip: Identify a confounding variable as an extra factor that affects the result and changes along with the independent variable.

Related tags

Experimental VariablesConfounding VariablePlant GrowthFertiliserSound ExperimentVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary Science

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