Question

Brian is testing to see how much water plants need. Why is it important that Brian includes a control group? A) To observe whether plants need water or not B)To confirm that plants need 25ml of water per day C)To confirm that plants need 75ml of water per day D) To observe one variable at a time

Answer 1

Answer: B or C

Explanation: The question does not include the variable or steps Brian is using so either one could be correct. It has to be the one that he is controlling though. This is because a control group is used to rule out any alternate explanations. Therefore the answer should be the one that he is trying to test out.