MCA Grade 8 Science Practice Questions - Minnesota Comprehensive Assessment (MCA-IV) Science - Grade 8 Exam

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A student investigates how different concentrations of a biodegradable road salt alternative affect the growth rate of native Minnesota cattails. What is the independent variable in this experiment?

The concentration of the biodegradable road salt alternative added to each container The total height and mass gained by the cattail plants after four weeks The type of soil and amount of daily sunlight received by all plants The water temperature of the test tanks throughout the investigation

Correct Answer:

The concentration of the biodegradable road salt alternative added to each container

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