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 7
A researcher is testing a new fertilizer. She uses three groups: one with no fertilizer, one with regular fertilizer, and one with the new fertilizer. Which group is the negative control?
A student is testing if salt affects the freezing point of water. She has one cup of pure water and one cup with salt. Which is the control?
A student tests if different colors of light affect plant growth. She uses red, blue, and green lights, and also grows some plants in normal white light. Which group is the control?
Describe how you would set up a control group in an experiment testing the effect of music on plant growth.
A researcher is testing a new fertilizer. She uses three groups: one with no fertilizer, one with regular fertilizer, and one with the new fertilizer. Which group is the negative control?
A scientist is testing a new medicine. She gives the medicine to one group and a sugar pill to another group. What is the sugar pill group called? (1) Experimental group (2) Control group (3) Variable group (4) Test group
A student is testing if salt affects the freezing point of water. She has one cup of pure water and one cup with salt. Which is the control?
A student tests if different colors of light affect plant growth. She uses red, blue, and green lights, and also grows some plants in normal white light. Which group is the control?
A scientist is testing a new medicine. She gives the medicine to one group and a sugar pill to another group. What is the sugar pill group called? (1) Experimental group (2) Control group (3) Variable group (4) Test group
A student wants to test if sunlight affects plant growth. She puts one plant in sunlight and another in a dark room. Which is the control group? (1) The plant in sunlight (2) The plant in the dark room (3) Both plants (4) Neither plant
Which of the following best describes a control variable? (1) The variable that is changed (2) The variable that is measured (3) The variable that is kept the same (4) The variable that is ignored
Which of the following best describes the purpose of a control group? (1) To test more variables (2) To provide a standard for comparison (3) To confuse the results (4) To increase the number of samples
Fill in the blank: A __________ is a factor that can change in an experiment.
Fill in the blank: A __________ variable is any variable that is kept constant during an experiment.
Fill in the blank: A placebo is often used as a __________ in medical experiments.
Fill in the blank: In a fair test, only the __________ variable should change.
True or False: A control group can help identify errors in an experiment.
True or False: A control group is always exposed to the variable being tested.
True or False: A control group is not necessary in every experiment.
True or False: A positive control should always give a predictable result.
