A well-written research question states the independent and dependent variables in the experiment. For example, a student investigated the effect of soil pH on the number of strawberries produced by a
strawberry plant. Her research question was "How does the pH of soil affect the number of strawberriesproduced by a strawberry plant?

10. Write a research question, using the format suggested in the Read This! box, for the experiment inModel 2.

11. A student wonders, "Does the moisture content in soil affect how far a worm can dig?" Identify the variables that are being considered in this experiment and the variables that need to be
controlled.

Independent

Dependent

Controlled