PISA (Programme for International Student Assessment) Experiment Practice Questions

A student observes the effect of sunlight on plant growth. What is the independent variable in this experiment?

• AA. Type of plant
• BB. Water
• CC. Amount of sunlight
• DD. Soil type

During a science experiment, a student measures the temperature of water at different time intervals. What is the dependent variable?

• AA. Time
• BB. Type of water
• CC. Amount of water
• DD. Temperature

A student is conducting an experiment on the effect of different fertilizers on plant growth. What should be the constant variable?

• AA. Amount of sunlight
• BB. Type of plant
• CC. Type of fertilizer
• DD. Amount of water

What is the primary purpose of a hypothesis in an experiment?

• AA. To prove a theory
• BB. To predict an outcome
• CC. To analyze results
• DD. To collect data