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In testing the effect of a new fertiliser which would be the control group?

Answer and explanation

Correct answer: Plant without the new fertiliser

Direct answer: Option B, a plant without the new fertiliser. A control group is treated like the experimental group except for the factor being tested. Here, the factor is the new fertiliser. The untreated plant shows what happens under normal conditions, so its growth can be compared with plants receiving the new fertiliser. Option A is wrong because double fertiliser is another treatment, not a normal baseline. Option B is correct because it lacks the new treatment while other conditions should remain comparable. Option C is wrong because being tallest is an observed result, not a group design. Option D is wrong because a different species introduces another variable and makes comparison unfair. Memory cue: the control group is the “no new treatment” comparison, not necessarily a plant with no care at all.

Related tags

Control GroupFertiliserPlant ExperimentHypothesis And ExperimentationExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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