Experimental Controls
Biology ⇒ Scientific Inquiry and Experimental Design in Biology
Experimental Controls starts at 7 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Experimental Controls.
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See sample questions for grade 11
A researcher is testing a new antibiotic. She uses one group with the antibiotic, one with a known antibiotic, and one with no antibiotic. What is the purpose of the group with the known antibiotic?
A scientist is testing the effect of a new fertilizer on tomato plants. She uses one group with the fertilizer and one group without. What is the control group in this experiment?
A scientist is testing the effect of temperature on bacterial growth. She uses one group at 37°C and another at 25°C. What is the independent variable?
A student wants to test if salt affects the boiling point of water. She boils pure water and water with salt. What is the control in this experiment?
Describe a scenario where a placebo control would be inappropriate.
Describe how you would design an experiment to test the effect of caffeine on reaction time, including the use of controls.
Describe the difference between a positive control and a negative control.
Explain how a lack of proper controls can affect the validity of experimental results.
Explain the importance of randomization in assigning subjects to control and experimental groups.
Explain why a control group is necessary in a well-designed experiment.
Explain why it is important to report the use of controls in scientific publications.
In a drug trial, why is it important to have a placebo group?
What is the main purpose of an experimental control in a scientific investigation?
Why is it important to keep all variables except the independent variable constant in an experiment?
Why might an experiment include more than one control group?
