How to Answer A-Level Biology Long-Answer Questions: Cambridge Has No Essay Paper, While Edexcel Features a 20-Mark Pre-Release Article Question

Let's clarify one thing first: the current Cambridge A-Level Biology (9700) does not have a separate "essay" section. In both the 2025–2027 and 2028–2030 syllabuses, the theory papers consist of "structured questions," with long-answer questions distributed throughout, prompted by command words such as Describe, Explain, and Discuss. Edexcel IAL Biology, on the other hand, explicitly includes "extended-writing" questions, and in the second year, Unit 5 features a 20-mark question based on a pre-released scientific article. Based on the syllabuses of both exam boards, this article clarifies where the long-answer questions in Biology are located, what they test, and how to write them. For the overall structure, see How A-Level Biology is Assessed; for practicals and Paper 5, see How to Prepare for A-Level Biology Practicals.

1. Where Are the Long-Answer Questions?

Cambridge Paper 5 (Planning, Analysis and Evaluation) requires "the use of extended structured writing." This is for experimental design questions, which are detailed in article 184 and will not be repeated here.

2. Cambridge: Official Definitions of AO1 and AO2

In Papers 2 and 4, AO1 and AO2 each account for 50%:

• AO1 Knowledge and understanding: Scientific phenomena, facts, laws, definitions, concepts, and theories; scientific vocabulary, terminology, and conventions; instruments and techniques; applications of science and their social, economic, and environmental impacts;
• AO2 Handling, applying, and evaluating information: Locating, selecting, organizing, and presenting information from a variety of sources; translating information between different forms; processing data; identifying patterns and trends and drawing conclusions; providing reasoned explanations for phenomena, patterns, and relationships; making predictions and constructing arguments to support hypotheses; applying knowledge to new situations; evaluating information and hypotheses; recognizing the limitations of biological theories and models; solving problems.

In other words, half the marks in structured questions test "application": understanding new materials, data, and situations provided in the questions, and explaining them using learned knowledge.

3. Command Words: Understand What the Question is Asking

Definitions from the Cambridge 9700 syllabus (excerpt):

• Describe: State key points, give characteristics and main features;
• Explain: State the purpose or reason, clarify relationships between things, explain why and/or how, and support with relevant evidence;
• Discuss: Write in a structured and detailed manner about one or more issues;
• Compare: Identify or comment on similarities and/or differences; Contrast: Identify or comment on differences;
• Outline: List the key points; Assess: Make a reasoned judgment.

The Edexcel IAL command word list (applicable to all its sciences) is more specific:

• Describe: Tell a story or state points in detail (often interconnected), but reasons or arguments are not required;
• Explain: Give reasons or examples for a point; the answer must include reasoning or argumentation;
• Compare and contrast: Must relate to both (or all) objects mentioned in the question, including at least one similarity and one difference;
• Discuss: Identify the issue being assessed in the question, explore its various aspects, and investigate through reasoning or argumentation;
• Evaluate: Review information and synthesize a conclusion, making a supported judgment based on evidence such as strengths, weaknesses, alternatives, and relevant data;
• Suggest: Apply knowledge to an unfamiliar situation, which may include content not directly taught in the syllabus.

Most common mistakes (based on experience): When asked to Explain, students only Describe, meaning they only state "what happened" without explaining "why"; when asked to Compare, they write a separate paragraph for each object instead of comparing them directly.

4. How to Write a Biology Long-Answer Question

Here are some experience-based tips:

1. Match points to marks: Biology is usually marked by points, with each marking point typically worth about 1 mark. For a 6-mark question, write at least 6 clear, non-repetitive points;
2. Use accurate terminology: Syllabus AO1 includes scientific vocabulary and terminology. For example, write "water potential" instead of "water concentration," and "complementary base pairing" instead of "pairing up";
3. Write in chronological order: When describing physiological processes (e.g., protein synthesis, nerve impulse transmission, photosynthesis), write step-by-step in the order they occur without skipping steps;
4. Show cause-and-effect chains for Explain: Use structures like "Because..., therefore..., leading to...";
5. Incorporate provided materials: AO2 tests application. If the question provides graphs or experimental data, quote specific values or trends instead of just writing textbook knowledge;
6. Avoid irrelevant content: Writing extra information will generally not earn extra marks and only wastes time.

5. Edexcel Unit 5 Pre-Released Article Question

The syllabus states that a scientific article is released before the Unit 5 exam, and there will be a question based on this article worth 20 marks. Here are some preparation tips (based on experience):

• Read the article carefully multiple times: Understand the biological content of each paragraph and look up all unfamiliar words and technical terms;
• Link the article to the syllabus: Highlight the syllabus topics covered in the article and review the relevant knowledge; be able to explain and evaluate any data or experimental methods mentioned;
• Predict questions: Create your own questions based on the article, such as explaining a process mentioned, evaluating a study, or calculating specific data;
• Don't memorize the article: The questions test understanding and application, not just reciting the article's content.

6. Synoptic Questions

Edexcel Units 4 and 5 may include synoptic questions, requiring knowledge from the first-year Units 1 and 2; the Unit 5 syllabus notes that synoptic questions may involve two or more topics. Cambridge Paper 4 also requires mastery of AS content. When preparing (experience-based advice), do not just focus on new content in the second year; link the core concepts from the first year (cell structure, biological molecules, enzymes, membrane transport, DNA and protein synthesis) with the second-year content during your review.

7. Common Reasons for Losing Marks

Here is a summary based on experience:

• Inaccurate terminology, or using everyday language instead of technical terms;
• Only describing phenomena for Explain, without providing reasons;
• Repetitive points: Writing the same idea twice in different words will only earn marks once;
• Ignoring provided data: Only writing background knowledge for graph or data questions;
• Writing comparisons separately without direct contrast;
• Skipping steps or mixing up the order when describing processes.

8. How to Practice

1. Compile a glossary: Organize key terms and definitions by topic; ensure you can spell and explain them;
2. Practice "point-based" writing: After completing a long-answer question, count the number of independent points you wrote and check if they cover the marks available;
3. Self-assess using mark schemes: Mark schemes for past papers are usually obtained through schools; ask your teacher for them to see what phrasing corresponds to each marking point;
4. Focus on unfamiliar contexts: Cambridge AO2 and Edexcel Suggest both test unfamiliar contexts; practice more questions based on new materials;
5. Edexcel students: Once you receive the pre-released article, prepare using the methods above.

Conclusion

The "essays" in A-Level Biology are long-answer questions within structured questions for Cambridge, and extended-writing questions plus the Unit 5 pre-released article question for Edexcel. Regardless of the format, the keys to scoring well are the same: understand the command words, use accurate terminology, provide enough points, and incorporate the provided materials. Turn these into habits, and you will consistently score well on long-answer questions. If you need A-Level Biology tutoring, feel free to chat with our teachers.

Verification note: This article was verified in September 2026. The formats (structured questions), durations, marks, assessment objective definitions, and paper weightings for all Cambridge 9700 theory papers, as well as the command word definitions and the Paper 5 requirement for "extended structured writing," are from the Cambridge International Biology 9700 syllabus for 2025, 2026 and 2027. The fact that Paper 4 remains structured questions without an essay section in the 2028–2030 syllabus is from that version of the syllabus. The question types (including extended writing) for each unit of Edexcel IAL Biology, the 20-mark pre-released scientific article question in Unit 5, synoptic question descriptions, and command word definitions are from the Pearson IAL Biology syllabus (2nd edition). The statement that "each marking point is worth about 1 mark," along with the answering methods, common reasons for losing marks, and practice methods, are our experience-based recommendations.

References:

• Cambridge International：AS & A Level Biology (9700)
• Pearson：International Advanced Level Biology