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Why should the initial size of potato pieces be kept the same in the salt-solution experiment?

Answer and explanation

Correct answer: So that the effect of size does not affect the results

If potato pieces have different sizes, their surface area and volume will differ. This can change the amount of water entering or leaving them by osmosis. Therefore, size is kept constant as a controlled variable, so that differences in the results are mainly due to the salt-solution concentration. Option A is incorrect because solution concentration may be the independent variable; it is not a reason to vary potato size. Exam tip: In a fair test, keep all factors that may affect the result constant.

Related tags

Controlled VariablesOsmosisPotato ExperimentSalt SolutionFair TestVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary Science

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