Variables in Experiments
Biology ⇒ Scientific Inquiry and Experimental Design in Biology
Variables in Experiments starts at 6 and continues till grade 12.
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See sample questions for grade 11
A researcher is testing the effect of pH on the rate of photosynthesis in algae. What is the dependent variable?
A scientist is investigating the effect of water temperature on the rate at which a chemical reaction occurs. What is the dependent variable?
A scientist is testing the effect of salt concentration on the rate of osmosis in potato cells. What is the independent variable?
A student investigates the effect of sugar concentration on yeast respiration rate. What is the dependent variable?
A student wants to test the effect of different fertilizers on plant height. What should be the controlled variables in this experiment?
Describe the difference between a dependent and an independent variable.
Describe what is meant by an extraneous variable.
Explain the consequences of not controlling variables in an experiment.
Explain why it is important to control variables in an experiment.
Explain why repeating an experiment and averaging the results is important when dealing with variables.
In a study investigating the effect of temperature on enzyme activity, identify the independent variable.
In a study, students are testing the effect of different types of music on plant growth. What is the independent variable?
In an experiment testing the effect of light intensity on plant growth, what is the dependent variable?
In an experiment, a student changes the amount of fertilizer given to plants and measures the number of leaves produced. Identify the independent and dependent variables.
In an experiment, the amount of water given to each plant is kept the same. What type of variable is this?
In an experiment, why is it important to have only one independent variable?
