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Which experiment is fair?

Answer and explanation

Correct answer: Changing one factor and keeping the others the same

Direct answer: Option A, changing one factor while keeping the other relevant factors the same, describes a fair experiment. A fair test is designed so that any important difference in the result can reasonably be linked to the one factor being tested. First decide the independent factor, change only that factor, keep temperature, time, amount, equipment, and other relevant conditions constant, and measure the dependent result in the same way. Option A works because it gives a valid comparison. Option B is unfair because different soil and water introduce several changes at once, so the cause of a result is unclear. Option C is poor science because recording only preferred results hides evidence and creates bias. Option D is unreliable because unchecked instruments may give inaccurate or incomparable measurements. Memory cue: one change, all other important conditions the same.

Related tags

Fair-TestVariablesExperiment-DesignHypothesis And ExperimentationExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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