Experimental Controls
Biology ⇒ Scientific Inquiry and Experimental Design in Biology
Experimental Controls starts at 7 and continues till grade 12.
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A researcher is testing the effect of temperature on enzyme activity. She includes a sample with a known enzyme concentration and optimal temperature. What type of control is this?
A scientist is testing the effect of a new antibiotic on bacteria. She includes a group of bacteria that receives no antibiotic. What is this group called?
Describe a scenario in which a positive control is necessary in a biological experiment.
Describe how a double-blind experiment helps improve the reliability of control groups.
A researcher is testing the effect of temperature on enzyme activity. She includes a sample with a known enzyme concentration and optimal temperature. What type of control is this?
A scientist is testing the effect of a new antibiotic on bacteria. She includes a group of bacteria that receives no antibiotic. What is this group called?
Describe a scenario in which a positive control is necessary in a biological experiment.
Describe how a double-blind experiment helps improve the reliability of control groups.
In a study testing the effect of a new fertilizer on crop yield, what would be an appropriate control group? (1) Crops with no fertilizer, (2) Crops with double fertilizer, (3) Crops with a different fertilizer, (4) Crops with extra water
In an experiment testing the effect of light on photosynthesis, what would be an appropriate negative control? (1) Plants kept in the dark, (2) Plants exposed to sunlight, (3) Plants given extra water, (4) Plants with no soil
Which of the following best describes a negative control? (1) A group where the independent variable is not applied, (2) A group where the independent variable is applied at the highest level, (3) A group that receives a placebo, (4) A group that is not measured at all
Which of the following best explains why replication is important in experiments with controls? (1) It increases the sample size, (2) It reduces the need for controls, (3) It helps confirm that results are consistent and reliable, (4) It allows more variables to be tested
Fill in the blank: A __________ control is expected to produce a known result, confirming that the experimental setup is capable of producing results.
Fill in the blank: A __________ variable is any variable other than the independent variable that could affect the outcome of an experiment.
Fill in the blank: In a controlled experiment, the group that receives the treatment is called the __________ group.
Fill in the blank: In a controlled experiment, the variable that is deliberately changed is called the __________ variable.
True or False: A placebo is often used as a control in clinical trials.
True or False: A positive control is used to show that the experimental setup can produce a positive result.
True or False: A well-designed experiment should have only one independent variable and one control group.
True or False: Controls are only necessary in experiments with human subjects.
