What is the function of a control in a scientific experiment?

• A. To manipulate the experimental group
• B. To provide a standard for comparison against the experimental group
• C. To ensure all variables are the same in every trial
• D. To collect additional data for the experiment

Answer: (B)

The function of a control in a scientific experiment is to provide a standard for comparison against the experimental group. In an experiment, researchers aim to determine the effects of a variable by observing the outcomes in the experimental group, which experiences a specific change, while the control group does not receive that change. This allows researchers to isolate the effects of the variable being tested, as any differences in results can be attributed to the manipulations made in the experimental group.

Using a control group is essential for validating the results, as it helps to account for other variables that might influence the outcome. By keeping everything else constant and introducing one variable at a time, researchers can have greater confidence that their observations are a direct result of the changes made during the experiment. Thus, the control serves as a baseline or reference point, helping to elucidate the effects of the treatment or intervention being tested.