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In a scientific question light water soil and temperature are all changed at the same time. What is the main difficulty?

Answer and explanation

Correct answer: It will be difficult to determine which variable caused the result

A scientific investigation is strongest when the effect of one chosen factor can be separated from the effects of other factors. The factor deliberately changed is usually called the independent variable, while the measured outcome is the dependent variable. Other important conditions should be kept constant so that the comparison is fair.

If light, water, soil, and temperature are all changed at the same time, a different result may be observed, but its cause cannot be identified confidently. It may be due to one factor, several factors together, or their interaction. Thus option A is correct: it becomes difficult to determine which variable caused the result. The other choices make claims that do not follow from changing several variables.

Related tags

Multiple-VariablesFair-TestCausationQuestion-DesignScientific Questions And ObservationsExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScience

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