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In an experiment on the effect of fertiliser which would be the control group?

Answer and explanation

Correct answer: Plant receiving no fertiliser

A control group is the comparison group that does not receive the experimental treatment, while other important conditions are kept as similar as possible. It shows what happens under ordinary conditions. Comparing the treated group with this baseline helps the investigator decide whether a difference is caused by the treatment rather than by unrelated conditions.

In a fertiliser experiment, the treatment is the addition of fertiliser. The plant receiving no fertiliser is therefore the control group, so option B is correct. The tallest plant is a result, not a comparison group, and the largest pot is merely a condition that could affect growth. For a fair test, the plants should also have similar light, water, soil, pot size, and starting conditions.

Related tags

FertiliserControl-GroupPlantHypothesis And ExperimentationExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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