Question

a student is setting up an experiment with several plants. her teacher recommends that she set up a control plant. why should the student have a control group in her experiment? a to make sure the plant would have grown under normal circumstances b to help the student become a better plant caretaker c to give the student more work to complete d to create a competition between the plants to encourage growth

Explanation:

In a scientific experiment, a control group is used to provide a baseline under normal conditions to compare with the experimental groups. Option A states the control group ensures the plant grows under normal circumstances, which matches the purpose of a control group (to have a standard for comparison). Options B, C, D are irrelevant to the scientific purpose of a control group.

Answer:

A. To make sure the plant would have grown under normal circumstances