1) A plant is watered with different amounts of water to see how it affects growth. What is the independent variable? a) Amount of water b) Plant type c) Growth rate d) Soil type 2) A scientist tests the effect of light on mold growth by using different light intensities. What is the dependent variable? a) Light intensity b) Mold growth c) Temperature d) Humidity 3) In an experiment to see how temperature affects solubility, what is a constant variable? a) Type of solute b) Temperature c) Solubility rate d) Amount of solvent 4) A student tests how the angle of a ramp affects the speed of a toy car. What is the independent variable? a) Ramp angle b) Car speed c) Car weight d) Ramp length 5) In an experiment to determine the effect of fertilizer on plant height, what is the dependent variable? a) Fertilizer type b) Plant height c) Soil pH d) Water amount 6) A researcher studies the effect of pH on enzyme activity. What is a constant variable? a) Enzyme type b) pH level c) Enzyme activity d) Temperature 7) In an experiment to see how sugar concentration affects yeast fermentation, what is the independent variable? a) Sugar concentration b) Yeast type c) Fermentation rate d) Temperature 8) A study examines how caffeine affects heart rate. What is the dependent variable? a) Caffeine amount b) Heart rate c) Age of subjects d) Diet 9) In an experiment to see how different materials affect heat retention, what is a constant variable? a) Material type b) Heat retention c) Initial temperature d) Time of exposure 10) A test is conducted to see how salt concentration affects water boiling point. What is the independent variable? a) Salt concentration b) Boiling point c) Water volume d) Heat source

Identifying Variables in Experiments

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