AQA GCSE Biology Required Practicals: The Complete List With Exam-Style Questions
The AQA biology required practicals are the most predictable marks in GCSE Biology, and the most commonly under-revised. AQA publishes the list, the apparatus and the skills being assessed. Nothing about them is a surprise. This page lists all ten, with what each one is really testing and the question styles that come up.
What do AQA ask about required practicals?
Rarely the result. AQA ask about variables, apparatus, method precision, sources of error, improvements and data handling. At least 15 percent of the marks on GCSE Biology assess practical skills, so expect 15 to 20 marks per paper drawn from this list — almost all of it answerable without having done the experiment, if you have revised the right five things.
What we see on our own learning portal: Visitors to Tutopiya’s AQA GCSE Biology pages rose 60% month on month in the 30 days to 5 November 2026, part of a broad shift in portal traffic toward UK GCSE science ahead of mock season. (Tutopiya learning portal data, 30 days to 5 November 2026.)
The five things to know for every practical
For each practical, make one side of A4 with these headings. Ten sheets is the entire revision task.
- Variables — independent, dependent, and at least two controlled
- Method — five or six numbered steps, with the measurement instrument named
- Main source of error — and why it affects the result in a specific direction
- One improvement — repeat readings, a water bath, a colorimeter instead of judgement by eye
- Expected result — including the shape of the graph and what the gradient means
The ten AQA GCSE Biology required practicals
| # | Practical | What it is really testing |
|---|---|---|
| 1 | Microscopy | Magnification calculations, drawing conventions, scale bars |
| 2 | Microbiology (culturing microorganisms, separate Biology only) | Aseptic technique, zone of inhibition area calculations |
| 3 | Osmosis in potato tissue | Percentage change calculation, control variables, surface drying |
| 4 | Food tests | Positive and negative results, controls, safety |
| 5 | Enzymes (effect of pH on amylase) | Continuous sampling, iodine test endpoint, buffer use |
| 6 | Photosynthesis (effect of light intensity) | Inverse square relationship, counting bubbles vs measuring gas |
| 7 | Reaction time | Human error, repeats, converting ruler drop to time |
| 8 | Plant responses (separate Biology only) | Controls in tropism experiments, randomisation |
| 9 | Field investigations — quadrats and transects | Sampling, random vs systematic, estimating population size |
| 10 | Decay / rate of decay (separate Biology only) | Controlled temperature, pH probe, time to colour change |
Combined Science Trilogy students take a subset of these; check which eight your school has delivered.
The four practicals that generate the most exam questions
Osmosis in potato tissue
Expect a percentage change calculation. The standard trap is forgetting that percentage change uses the initial mass as the denominator, and the second trap is failing to explain why the chips must be blotted dry before reweighing. A good answer names surface water as an added mass that is not due to osmosis.
Exam-style question: A student found one potato chip gained mass in a 0.4 mol/dm³ solution while the others lost mass. Suggest two reasons for this anomalous result. The marks are for specific, plausible procedural reasons — not “they made a mistake”.
Effect of light intensity on photosynthesis
The examinable physics here is the inverse square law: double the distance, quarter the light intensity. Questions ask you to explain why the rate falls off faster than the distance increases, or to identify the limiting factor at the plateau. Know that at high light intensity, carbon dioxide concentration or temperature becomes limiting.
Enzymes and pH
The key method detail is sampling at fixed intervals onto a spotting tile with iodine, and the endpoint is when iodine stays orange-brown. Common question: why is a water bath used rather than heating directly? Answer in terms of a constant, controlled temperature, not “it is safer”.
Quadrats and transects
Questions turn on sampling method. Random sampling is used to estimate the population of the whole area and must be genuinely random, usually using coordinates from a random number generator. A transect is used when you want to study a change across a gradient. Confusing the two is the single most common error.
How to practise
- Write the five-heading sheet from memory for each practical, then check it against the specification.
- Do the calculations by hand: percentage change, magnification, mean, rate from a gradient, and area of a zone of inhibition.
- Answer past practical questions by command word. “Suggest” wants a plausible reason; “explain” wants a mechanism; “evaluate” wants both sides.
- Learn the apparatus names. Measuring cylinder, not “tube”. Marks are lost on vocabulary.
For broader practice on question styles, our guide on required practicals: GCSE question types and examples works through sample questions, and GCSE mock exams: what to revise first shows where practicals fit in a mock plan.
Sources and a caveat
The required practical list, apparatus and techniques requirements and the 15 percent practical assessment weighting are set out in the AQA GCSE Biology (8461) and Combined Science: Trilogy (8464) specifications, available from AQA. AQA’s practical handbook for each specification is the definitive method reference; your school’s version of a method may differ slightly in apparatus, and the exam will accept any valid method.
Primary sources
Portal figures are Tutopiya learning portal data read from the Learning Portal growth and health dashboard on 6 November 2026, comparing the 30 days to 5 November 2026 with the preceding 30 days.
Next step: build the ten A4 sheets this week, then test yourself with past practical questions and mark against the official scheme. If data analysis is the weak point, a GCSE biology tutor can drill graph and calculation questions quickly.
Frequently asked questions
How many required practicals are there in AQA GCSE Biology? +
There are 10 required practicals in AQA GCSE Biology (8461) and 8 biology required practicals within AQA Combined Science Trilogy. Questions about them can appear on either paper, not only the paper covering that topic.
How many marks are required practicals worth in GCSE Biology? +
At least 15 percent of the marks across the GCSE assess practical skills, and required practicals are the main vehicle for that. In a typical paper this is 15 to 20 marks.
Do I have to have done the practical to answer the question? +
The questions are written so that a student who carried out the practical can answer from experience, but the content is all learnable. What you need is the method, the variables, the sources of error and the expected result — not a memory of the lesson.
What is the most commonly examined required practical in AQA Biology? +
Osmosis in potato tissue, the food tests, and the effect of light intensity on photosynthesis recur most often, usually framed around variables, percentage change calculations or anomalous results.
Are required practicals on both Paper 1 and Paper 2? +
Yes. Practicals from the Paper 1 topics are more likely on Paper 1, but AQA can and does assess practical skills generically on either paper, including apparatus, measurement and data handling.
Is demand for AQA GCSE Biology revision rising? +
Yes. Visitors to Tutopiya's AQA GCSE Biology pages rose 60% month on month in the 30 days to 5 November 2026, part of a broad shift in portal traffic toward UK GCSE science ahead of mock season. Figures come from Tutopiya's own learning portal analytics, read from the Learning Portal growth and health dashboard on 6 November 2026.
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Mahira Kitchil
Project Head of AI Buddy
Mahira Kitchil is Project Head of AI Buddy at Tutopiya, where she works with schools and families across the UK, Malaysia, India and the Gulf. She follows Cambridge, Pearson Edexcel, AQA, OCR and IB announcements as they land in each market, and writes these guides from published syllabuses, board timetables and regulator guidance rather than second-hand summaries.
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