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Scientific Method Practice Problems

Grades 4-9 · 5 problems

Test your understanding of the scientific method with these practice problems. Learn to identify hypotheses, variables, and conclusions.

Tip: Remember that a good hypothesis is testable and falsifiable. It should be possible to design an experiment that could prove your hypothesis wrong.
1

A student wants to test if fertilizer affects plant growth. They plant two identical seeds in separate pots with the same soil and water. One pot receives fertilizer, and the other does not. What is the independent variable?

2

A scientist observes that plants grow taller in sunny locations compared to shady locations. What is a possible hypothesis?

3

A researcher is testing the effect of different amounts of sugar on the growth of yeast. They prepare five solutions with varying sugar concentrations and measure the yeast population after 24 hours. What is the dependent variable?

4

A group of students wants to determine if the type of liquid affects how quickly an ice cube melts. They place identical ice cubes in separate cups containing water, juice, and oil, all at the same temperature. What are the controlled variables?

5

A scientist conducts an experiment to test the effectiveness of a new drug on reducing blood pressure. They divide participants into two groups: one receives the drug (treatment group), and the other receives a placebo (control group). After several weeks, the scientist analyzes the data and finds that the treatment group shows a statistically significant reduction in blood pressure compared to the control group. What conclusion can the scientist draw?

Common Mistakes

  • Confusing the independent and dependent variables.
  • Not including a control group in the experiment.
  • Failing to identify and control variables that could affect the outcome.