Experimental design questions are one of the most common—and highest-scoring—components of the AP Biology exam. Whether they appear in multiple-choice form or as part of an FRQ, these questions test your ability to think like a scientist. At RevisionDojo, we’ll break down exactly what these questions are asking, how to answer them, and the mistakes you must avoid.
What Are Experimental Design Questions?
In AP Biology, experimental design questions require you to:
- Interpret a research scenario or lab setup
- Identify variables, controls, and constants
- Predict possible outcomes
- Suggest modifications to improve the experiment
- Justify your reasoning with biological principles
Why They Matter for Your AP Biology Score
- High frequency – Almost every exam includes experimental design elements.
- Multiple skills tested – Data analysis, hypothesis formulation, and application of content knowledge.
- Scoring potential – These are often “point-rich” questions, especially in FRQs.
RevisionDojo Tip: Think of these questions as a chance to show the graders that you understand both biology and the scientific method.
The Core Components of Experimental Design
1. Identifying Variables
- Independent variable – What you change.
