Which question includes a clear measurable outcome?

Correct answer: How does the amount of water affect a plant's height over seven days?

Option B states a measurable outcome, “plant height,” and gives a fixed time period of “seven days.” The water amount can be varied, while height can be measured in centimetres and compared. In options A and C, words such as “good” and “like” do not identify a clear measurable result. Exam tip: Look for the quantity to be measured and a stated time period in a scientific question.