One of the most intimidating AP Biology FRQ types is the “Design an Experiment” question. It requires more than memorization — you must demonstrate scientific thinking, a solid grasp of experimental design principles, and clear communication.
RevisionDojo has broken this question type into a step-by-step strategy so you can confidently tackle it on test day.
1. Understand What College Board Is Looking For
The experimental design FRQ usually asks you to:
- Develop a testable hypothesis.
- Identify independent and dependent variables.
- Describe a control group and constants.
- Outline methods for data collection.
- Predict expected results.
They want to see that you can think like a scientist — asking a focused question, setting up a valid experiment, and explaining how the results will be interpreted.
2. Break Down the Prompt
When you see an experimental design FRQ, do this immediately:
- Underline the main biological process (e.g., photosynthesis, enzyme activity, population growth).
- Circle the task words — “design,” “propose,” “describe,” “predict.”
- Identify the specific relationship they want you to test.
3. Start with a Hypothesis Statement
Your hypothesis should:
- Be testable and specific.
- Include both variables.
