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What is the benefit of changing only the independent variable in an experiment?

Answer and explanation

Correct answer: Its effect can be identified accurately

In a fair experiment, the independent variable is deliberately changed while other important conditions are kept the same. The result that may respond to this change is measured as the dependent variable. Keeping other factors controlled makes it much easier to decide whether the observed change was caused by the independent variable rather than by temperature, amount, time, or another uncontrolled condition.

Option A is correct because changing only the independent variable helps isolate its effect and identify it accurately. It does not make every result identical; results may still differ because of the tested effect or measurement uncertainty. The dependent variable does not disappear, and measurement remains essential for recording the outcome. This procedure is therefore a foundation of a fair or controlled test.

Related tags

Independent VariableFair TestControlled ExperimentNature And Meaning Of ScienceExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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