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 8
Describe how a control group helps to eliminate bias in an experiment.
Describe the difference between a positive control and a negative control in an experiment.
Describe what a 'controlled variable' is in an experiment.
Explain what would happen if an experiment did not include a control group.
Explain why a placebo is used in some experiments.
Fill in the blank: In an experiment testing the effect of sunlight on plant growth, the group of plants kept in the dark would be the __________ group.
In a drug trial, what is the purpose of giving the control group a placebo?
In a study testing a new fertilizer, which group would be the control? (1) Plants with new fertilizer, (2) Plants with no fertilizer, (3) Plants with double fertilizer, (4) Plants with water only
In a study testing a new fertilizer, which group would be the control? (1) Plants with new fertilizer, (2) Plants with no fertilizer, (3) Plants with double fertilizer, (4) Plants with water only
In an experiment testing the effect of salt on the boiling point of water, what would be the control group? (1) Water with salt, (2) Water with sugar, (3) Pure water, (4) Water with oil
In an experiment testing the effect of temperature on enzyme activity, what would be an appropriate control? (1) Enzyme at optimal temperature, (2) Enzyme at no temperature, (3) Enzyme with no substrate, (4) Enzyme with extra substrate
Which of the following best describes a negative control? (1) A group where no response is expected, (2) A group where a strong response is expected, (3) A group with random variables, (4) A group with extra variables
Fill in the blank: A __________ is a standard against which experimental results can be compared.
Fill in the blank: A __________ variable is the one that is deliberately changed in an experiment.
Fill in the blank: In a controlled experiment, the group that does not receive the independent variable is called the __________ group.
Fill in the blank: In a controlled experiment, the variable that is measured is called the __________ variable.
True or False: A control group can sometimes receive a fake treatment.
True or False: A control group receives the same treatment as the experimental group except for the variable being tested.
True or False: A well-designed experiment should have more than one control group if possible.
True or False: Controls are only used in biology experiments.
