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If exercise duration is changed and pulse rate is measured, what type of variable is pulse rate?

Answer and explanation

Correct answer: Dependent variable

The dependent variable is the quantity that is measured to find out how it responds to a change. The independent variable is changed by the investigator, and controlled variables are kept the same. In a clear experiment, the measured result is often described as the effect, while the deliberately changed factor is described as the cause being tested.

In this case, the duration of exercise is changed. The pulse rate is then measured after or during the exercise to see how it responds. Thus exercise duration is the independent variable and pulse rate is the dependent variable. Pulse rate is not a constant or a controlled variable because it is the observed outcome. Therefore option D is correct.

Related tags

ScienceDependent-VariableExercisePulse-RateVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceClass 9 Mcq

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