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A student concluded that fertiliser makes plants grow faster but also gave more water to fertilised plants. What is the main weakness of the conclusion?

Answer and explanation

Correct answer: Water became a confounding variable

Extra water may also affect growth so the effect of fertiliser cannot be isolated. Identify uncontrolled factors in exams.

Related tags

Confounding VariablePlant ExperimentFair TestNature And Meaning Of ScienceExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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