Current syllabus · first assessment 2019

A-Level Biology A2 Study Guide & Review

Complete Pearson Edexcel International A Level Biology through IA2 Units 4–6 by connecting advanced mechanisms, synoptic evidence, scientific-article analysis, Core Practicals 10–18 and precise statistical reasoning.

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  1. 01Learn concepts
  2. 02Practise questions
  3. 03Review mistakes

How to study Pearson Edexcel International A2 Biology

Pearson Edexcel IA2 Biology extends IAS foundations through Units 4–6 and expects synoptic application. Use the IA2 syllabus map to connect energy flow, ecosystems, microbiology, immunity, respiration, homeostasis, coordination and gene technology to unfamiliar evidence. Explain each causal sequence, choose calculations or statistical tests from the biological question, preserve units and precision, and state exactly what the result supports rather than treating Topics as isolated notes.

Rebuild the advanced mechanism or investigation logic in Concept and retrieve linked facts, variables and statistical conditions in Mastery without copying notes. Apply them through the Question Bank and repair the first failed mechanism, synoptic link, article inference, statistical choice or method decision. Rehearse complete Unit 6 investigations and analyse the correct Unit 5 scientific article confirmed for your paper variant.

Practise IA2 Biology by evidence type

Use distinct routines for energy mechanisms, ecological and immune evidence, homeostatic coordination, scientific-article analysis and Unit 6 practical statistics.

Energy flow and biological rates

Photosynthesis, ATP, respiration, productivity, trophic transfer and environmental factors

Draw the causal or energetic sequence before interpreting a rate. Identify the limiting variable, convert units, calculate productivity or transfer where required and connect graph shape to the underlying mechanism, then check whether the conclusion is compatible with uncertainty and the experimental range.

Practise Topic 5

Ecology, microbiology, immunity and forensic evidence

Sampling, succession, microorganisms, growth curves, antibiotics, immune responses and DNA evidence

Match the claim to the sampling, culture, immune or forensic evidence that can test it. Choose chi-squared, a t-test or correlation only for the question each addresses, state a null hypothesis, interpret significance correctly and avoid turning association into causation.

Practise Topic 6

Respiration, homeostasis, coordination and gene technology

Muscles, gas exchange, kidneys, nerves, hormones, plant responses and genetic manipulation

Connect structure to regulation through a complete feedback or signalling chain, including stimulus, receptor, coordination and response. For gene technology, trace enzymes, vectors, selection and expression in order, then use unfamiliar evidence to judge effectiveness, risk or limitation.

Practise Units 5 concepts

Unit 5 scientific-article preparation

Specification links, unfamiliar terminology, techniques, datasets, claims and command words

Map every paragraph to relevant specification concepts, define unfamiliar biological terms and explain the principles of named techniques. Convert claims into questions using varied command words and draft evidence-based answers; do not predict the live paper or rely on annotations, because Pearson supplies a fresh article copy.

Practise Unit 5

Unit 6 practical and statistical reasoning

Core Practicals 10–18, planning, variables, safety, graphs, tests, uncertainty and evaluation

Reconstruct each investigation from purpose through variables, apparatus, controls, ethics, measurements and data analysis. Select the statistical test by its question, justify graph and precision choices, state conclusions within the evidence and pair each specific error or limitation with a feasible improvement.

Practise Unit 6

Where to start

Start from a known Unit Topic or diagnose whether the recurring weakness is advanced mechanism, synoptic application, article analysis, statistics or practical evaluation.

Choose your starting point

  1. I know the weak Topic

    Open the exact Unit, practical or mathematics destination and identify the failed mechanism, evidence, statistic or investigation decision.

    Browse the IA2 units

  2. I do not know what is weak

    Use mixed WBI14–WBI16 questions to separate prerequisite gaps from article, data, statistical and practical-method failures.

    Start an IA2 diagnostic

Choose the right IA2 Biology starting point

  1. Explain the advanced mechanism

    Reconstruct the biological sequence, regulatory relationship or ecological interaction and connect it to IAS foundations and observable evidence.

    Review a Concept

  2. Retrieve evidence and conditions

    Reproduce linked facts, practical variables, units and conditions for statistical or mathematical methods without notes.

    Check Mastery

  3. Apply, judge and repair

    Answer an unfamiliar dataset, article or investigation question, identify the first unsupported decision and retry with corrected reasoning.

    Practise questions

Explore the Pearson Edexcel Biology IA2 units

Navigate four advanced theory Topics across Units 4–5, the written Unit 6 practical-skills destination and five cross-cutting mathematical areas. The 4-group, 10-Topic map owns WBI14–WBI16 while linking Core Practicals 10–18, Unit 5 article work and synoptic IAS foundations.

4
syllabus groups
10
mapped topics

Unit 4: Energy, Environment, Microbiology and Immunity

Open unit questions
Topic 5 - Energy Flow, Ecosystems and the EnvironmentTopic 6 - Microbiology, Immunity and Forensics

Unit 5: Respiration, Internal Environment, Coordination and Gene Technology

Open unit questions
Topic 7 - Respiration, Muscles and the Internal EnvironmentTopic 8 - Coordination, Response and Gene Technology

Unit 6: Practical Skills in Biology II

Open unit questions
Practical Skills in Biology II

Assessed mathematical skills and measurement conventions

Open unit questions
A.0 Arithmetic and numerical computationA.1 Handling dataA.2 AlgebraA.3 GraphsA.4 Geometry and trigonometry

Pearson Edexcel International A2 Biology assessment

IA2 consists of three externally assessed written units. WBI14 and WBI15 each contribute 40% of IA2, while WBI16 contributes 20%; the full YBI11 International A Level combines these with IAS Units 1–3.

Paper / componentQuestionsTime% of grade
Unit 4 Energy, Environment, Microbiology and Immunity (WBI14/01)Multiple-choice, short-open, open-response, calculations and extended writing90 marksAll questions are compulsory in familiar and unfamiliar contexts across Topics 5–6. The paper is synoptic, may require Units 1–2 knowledge and includes at least 9 marks of Level 2-or-above mathematics.How to prepare: Integrate mechanism explanations with unfamiliar ecological, microbiological and immunity data. Practise calculations, sampling and statistical choices alongside synoptic retrieval, then make conclusions that distinguish association, difference and causal evidence rather than revising Topics 5–6 as isolated notes.1 hour 45 minutes40% of IA2
Unit 5 Respiration, Internal Environment, Coordination and Gene Technology (WBI15/01)Multiple-choice, short-open, open-response, calculations and extended writing90 marksAll questions are compulsory across Topics 7–8, with synoptic assessment and at least 9 mathematics marks. One 20-mark question is underpinned by a pre-release scientific article supplied clean in the examination.How to prepare: Practise regulatory and gene-technology mechanisms with unfamiliar evidence, then prepare the confirmed article by linking paragraphs to specification biology, terms, techniques and datasets. Write varied command-word questions and answers; do not rely on annotations or predict the live question.1 hour 45 minutes40% of IA2
Unit 6 Practical Skills in Biology II (WBI16/01)Short-open, open-response and calculation questions50 marksThis external written paper assesses synoptic experimental procedures and techniques across the qualification, including planning, data, graphs, statistics, conclusions, uncertainty and evaluation. It includes at least 5 mathematics marks.How to prepare: Reconstruct investigations from purpose to conclusion, using Core Practicals 10–18 and earlier procedures. Practise variables, apparatus, controls, safety and ethics, statistical test selection, units, significant figures, uncertainty, evidence-bounded conclusions and specific improvements; Unit 6 is not a live laboratory exam.1 hour 20 minutes20% of IA2

SourcePearson Edexcel · International Advanced Level Biology SpecificationYBI11 · Issue 2 · February 2021

Pearson Edexcel International A2 Biology questions

The IA2 stage consists of Unit 4 WBI14, Unit 5 WBI15 and Unit 6 WBI16. Units 4–5 cover Topics 5–8, while Unit 6 assesses Practical Skills in Biology II. Units 4–6 alone are not the full qualification; YBI11 requires IAS Units 1–3 as well.

Use the article confirmed for your paper variant by your Exams Officer. Map each paragraph to specification concepts, define terms and techniques, analyse data and claims, then write and answer questions with different command words. Pearson supplies a fresh copy in the examination, so personal annotations cannot be taken in.

No. Unit 6 is a written examination of planning, experimental procedures, data processing, graphs, statistics, conclusions, uncertainties and evaluation. Preparation should use Core Practicals 10–18 and practical procedures from Units 1–2, because WBI16 is synoptic and is not limited only to IA2 practical contexts.

You should select and interpret chi-squared tests for observed versus expected values, Student's t-tests for comparing means and correlation coefficients for association. State an appropriate null hypothesis and interpret significance in biological context. A significant correlation does not establish causation, and each test answers a different question.