Why Command Terms Matter in IB Biology
Command terms such as define, describe, compare, evaluate, and discuss determine exactly how examiners expect you to respond. Misinterpreting a command term—even when your biological knowledge is correct—can result in lost marks. Understanding and applying command terms accurately is therefore essential for success in both Paper 1 and Paper 2.
Common IB Biology Command Terms Explained
The following interpretations align with IB assessment expectations:
- Define: Provide a precise and formal meaning.
- Describe: State characteristics or features without explanation.
- Outline: Give a brief, structured summary of key points.
- Explain: Show how or why something occurs, using cause-and-effect reasoning.
- Compare: Identify both similarities and differences between two concepts.
- Evaluate: Weigh strengths and weaknesses and reach a justified conclusion.
- Discuss: Present multiple viewpoints or arguments and conclude with a reasoned judgment.
Confusion between similar terms—such as describe and explain—is a common reason for incomplete or unfocused answers.
Applying Command Terms in an IB Biology Context
Examples
- Compare mitosis and meiosis
Include similarities (cell division, stages) and differences (chromosome number, genetic variation). - Evaluate enzyme-linked assays versus diffusion-based methods
Assess reliability, sensitivity, limitations, and practical considerations before concluding.
