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 12
A researcher is testing the effect of caffeine on heart rate in mice. List one possible controlled variable.
A researcher wants to test the effect of different water temperatures on the rate of fish respiration. List one controlled variable for this experiment.
A scientist is testing the effect of pH on bacterial growth. What is the independent 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 fermentation rate. What is the independent variable?
A student investigates the effect of temperature on enzyme activity. Identify the independent variable.
A student wants to test the effect of different amounts of fertilizer on tomato plant yield. What is the dependent variable?
Describe how you would identify the dependent variable in a scientific investigation.
Describe the difference between independent and dependent variables.
Describe the role of the independent variable in hypothesis testing.
Describe what is meant by an extraneous variable and how it can be managed in an experiment.
Explain how a confounding variable can affect the results of an experiment.
Explain the importance of having a control group in an experiment.
Explain why it is important to control variables in an experiment.
Explain why it is important to repeat experiments and control variables.
Explain why random variables can threaten the validity of an experiment.
In a study measuring the effect of fertilizer type on crop yield, what is the dependent variable?
In an experiment testing the effect of light intensity on plant growth, what is the dependent variable?
In an experiment, a scientist measures the effect of different wavelengths of light on the rate of photosynthesis. What is the dependent variable?
In an experiment, a student measures the effect of different soil types on the height of bean plants. What is the dependent variable?
