Cambridge Biology 9700 Paper 3: Current Advanced Practical Skills Guide

Q: What does Cambridge International Biology 9700 Paper 3 assess?
A: Paper 3 is the two-hour Advanced Practical Skills test. Candidates carry out laboratory investigations and light-microscope activities and are assessed on manipulation, measurement, observation, data presentation, analysis, conclusions, and evaluation.

TL;DR
Paper 3 has 40 marks and contributes 23% of AS Level or 11.5% of A Level. It contains two or three questions and may use biological contexts outside the syllabus content. Confirm the 9700 entry and centre arrangements before selecting papers or making practical plans.

Last reviewed: 19 July 2026. This guide is bounded to Cambridge's current 2025-2027 Biology 9700 specification. It describes the published assessment contract and skills, not the exact investigation, specimen, or question order for a future paper.

1. Paper 3 at a glance

Paper 3 is one of the three AS-only components. It can also contribute to the full A Level through a valid staged entry or by taking all five components in one series. Paper 5 is an additional Planning, Analysis and Evaluation component for the A Level route; it does not replace Paper 3.

2. Confirm the entry and centre arrangements

Ask the school or examination centre to confirm:

1. the Biology 9700 syllabus and examination series;
2. the administrative zone and Paper 3 component code;
3. whether the entry is AS only, staged A Level, or all A Level components in one series;
4. reporting time, permitted items, and local instructions;
5. any current carry-forward or centre deadlines that affect the route.

Paper 3 apparatus requirements vary by paper. Cambridge issues the complete apparatus and materials list to centres in Confidential Instructions. Candidates should follow the centre's arrangements rather than trying to predict or bring an unpublished setup.

3. Published paper structure

Paper 3 requires an investigation or investigations. Candidates may make technique decisions, collect quantitative or qualitative data, present results, perform calculations, analyse data, draw conclusions, and suggest procedural improvements or extensions.

The paper also requires light-microscope activities. Candidates may prepare slides, observe specimens, present observations, perform calculations, and make deductions and conclusions. Cambridge requires centres to provide microscopes for half the candidates at a time, so one group starts with the investigation while the other starts with microscope access.

Questions may use different AS Biology areas and unfamiliar contexts. Cambridge supplies instructions where unfamiliar materials or techniques are required. No dissection of material of animal origin is required in Paper 3.

4. Current mark allocation

The ranges describe the current paper allocation. They do not guarantee an identical distribution between individual questions or one fixed topic sequence.

5. Investigation decisions and data collection

Within an investigation, candidates should be able to identify the independent and dependent variables and decide:

• a suitable range for the independent variable;
• at least five different independent-variable values and suitable intervals;
• how to change the independent variable and measure the dependent variable;
• the number of replicates at each value;
• appropriate controls;
• which variables need standardising and how to standardise them.

Candidates follow instructions to collect quantitative or qualitative results, consider hazards and assess risk as low, medium, or high, and take readings or observations that support accurate work.

6. Microscopy, observations, and drawings

Candidates may need to set up a light microscope, find and draw specified tissues or cells, make a temporary slide of stained material, calculate actual sizes from magnification or scale information, and estimate cell or organelle counts using a sampling method.

Current drawing and observation requirements include:

• plan diagrams that show tissue distribution without drawing cells;
• correct relative proportions of tissue layers;
• cell drawings with observable shape, relative size, and contents only;
• cell-wall thickness shown with the applicable number of lines;
• measurements from specimens or photomicrographs using supplied scale information;
• similarities and differences based only on observable features;
• sharp-pencil lines that are fine, clear, and unbroken;
• use of most of the available drawing space, with no shading.

Draw what is observed. A memorised textbook diagram does not replace the specimen, slide, photomicrograph, or instructions supplied.

7. Tables, calculations, graphs, and charts

Cambridge publishes detailed presentation requirements.

• Separate raw and processed results where appropriate.
• Use descriptive table headings with units and no units in the table body.
• Put the independent variable to the left of, or above, the dependent variable.
• Record quantitative data to the precision supported by the instrument.
• Record qualitative observations with clear descriptions.
• Show calculation steps and reasoning.
• Give calculated values the same number of significant figures as, or one more than, the smallest number of significant figures in the data used.
• Use a graph for continuous data, a bar chart for discontinuous or categorical data, and a histogram for frequency data.
• Put the independent variable on the horizontal axis and the dependent variable on the vertical axis.
• Label axes to match the table headings and use most or all of the grid with a readable scale.
• Plot points accurately as small crosses or small encircled dots.
• Use the line treatment supported by the data: a best-fit line, smooth curve, or ruled straight lines joining points.
• Do not extrapolate unless the data justifies it.

Do not transfer graph rules from another subject or component. Follow the current Biology specification and the instruction in the question.

8. Analysis, conclusions, and evaluation

Candidates may calculate from collected or supplied data, use graphs to find unknown values, estimate unknown concentrations from qualitative results, identify biological molecules, identify and address anomalies, describe patterns and trends, and evaluate confidence in conclusions.

A conclusion should summarise the result, use the relevant evidence, and state whether a hypothesis is supported where that is asked. A change in a value alone does not establish its biological explanation.

For evaluation, identify the main systematic or random error and connect the improvement to that limitation. Published examples include better standardisation, a more accurate dependent-variable measurement, smaller independent-variable intervals, and replicate measurements so that a mean can be calculated. A generic phrase such as "human error" does not identify the limited step.

9. A source-bounded preparation method

The following is study advice, not a Cambridge rule.

1. Verify the component and route before selecting papers.
2. Practise supervised apparatus handling and microscope setup using the current specification.
3. Tag errors by the three published skill groups.
4. Redraw tables, calculations, graphs, charts, and biological drawings using Cambridge's conventions.
5. Base conclusions on the collected or supplied evidence.
6. For an evaluation, name the limited step, explain its effect, and propose a matching improvement.
7. Use timed papers after the underlying practical and reasoning errors are understood.

The specification gives schools course-level practical-work guidance, but it does not prescribe one commercial course, provider, mock schedule, or fixed number of tuition-laboratory sessions for an individual candidate.

10. What this guide does not establish

The specification does not establish:

• a particular Singapore centre's Paper 3 availability;
• the exact investigation, material, specimen, or question order in a future paper;
• a guaranteed enzyme, osmosis, pigment, transport, or ecology pattern;
• one fixed graph line or evaluation phrase for every task;
• that Paper 5 replaces Paper 3;
• a fixed number of past papers, mocks, or laboratory sessions needed for a grade;
• grade improvement from tuition or any other preparation format.

For the additional A Level written component, use the Biology 9700 Paper 5 route guide, noting that its detailed body remains a separate fact-check scope.

References

1. Cambridge International, AS & A Level Biology 9700 syllabus for 2025-2027.
2. Cambridge International, AS & A Level Biology 9700 overview.