What is the difference between Core and Extended Biology?

Core covers the essential content and is graded C to G. Extended covers the Core plus the Supplement, the additional, more mechanistic content, and is graded A* to G. Students aiming for top grades or continuing to A-Level or IB should take Extended.

IGCSE Biology (0610): Complete Guide to Topics, Exams & Grades

Cambridge IGCSE Biology (0610) is the most popular of the three separate sciences, and for many students in Malaysia it is the subject that opens the door to medicine, dentistry, pharmacy, biotechnology and the life sciences. It is also, quietly, one of the most misjudged, students assume it is a memorising subject and are surprised when half the marks go to handling data, explaining mechanisms and interpreting experiments they have never seen before. This guide explains everything a parent or student needs to know: the 21 topics, how the three papers work, what the practical exam actually tests, the command words that decide marks, and how the qualification is graded.

Quick answer

IGCSE Biology (0610) is a tiered qualification: Core (grades C–G) or Extended (grades A*–G). Students sit three papers, multiple choice, theory, and a practical paper, worth 30% / 50% / 20%. The course has 21 topics. Only half the marks come from recall; the other half tests data handling and application in unfamiliar contexts.

Overview

What is IGCSE Biology (0610)?

Cambridge IGCSE Biology (syllabus code 0610) is the standard international biology qualification for students aged roughly 14 to 16, usually studied over Years 10 and 11. It builds scientific knowledge and understanding, develops experimental and problem-solving skills, and trains students to communicate clearly using scientific terminology.

Tiered	Students follow either Core (grades C–G) or Extended (grades A*–G). Extended includes everything in Core plus the more mechanistic Supplement content.
Practical requirement	Experimental skills are formally assessed and count for 20% of the final grade.
Study time	Approximately 130 guided learning hours, typically over Years 10 and 11.
Recognition	Benchmarked as comparable to the UK GCSE, accepted by universities worldwide. Students achieving A* to C are well prepared for A-Level, IB and other pathways.
Exam series	Available in the June and November series (and March in some regions).
Restrictions	Cannot be taken in the same series as O Level Biology (5090), Cambridge IGCSE (9–1) Biology (0970), Combined Science (0653), Co-ordinated Sciences Double Award (0654 and 0973), or O Level Combined Science (5129).

New to IGCSE grading?

Our companion guide, The IGCSE Grading System Explained, covers A*–G, grade thresholds and what each grade means for your child’s next step.

What the course builds

Assessment objectives: where the marks actually come from

Every exam question tests one of three assessment objectives. Their weightings tell you exactly how to prepare, and why memorising definitions alone is not enough.

50%

AO1, Knowledge

Recalling and explaining scientific phenomena, facts, laws, definitions and concepts; scientific vocabulary; apparatus and safety; applications and their implications.

30%

AO2, Problem-solving

Selecting and presenting information, translating between forms, manipulating data, identifying patterns, forming conclusions and solving problems, deliberately in unfamiliar contexts.

20%

AO3, Practical skills

Planning investigations, using apparatus safely, recording observations, interpreting and evaluating data, and evaluating methods. Tested entirely by the practical paper.

On the multiple-choice and theory papers, AO1 accounts for roughly 63% of marks and AO2 for 37%, and AO3 does not appear at all. On the practical paper, it is 100% AO3. The practical implication: half the qualification is not recall. AO2 questions are set in unfamiliar contexts, requiring students to apply syllabus principles to situations they have never seen. A student who has memorised every definition but never practised data interpretation is capped well below their potential.

The Most Important Decision

Core or Extended? Choosing the right tier

This sets a ceiling on the possible grade. Cambridge’s own guidance is that candidates expected to achieve grade D or below should enter Core, and those expected to achieve C or above should enter Extended.

Core tier

Essential content

C D E F G

Grades C to G only. A Core candidate cannot be awarded above a C. Papers: 1 (MC) + 3 (theory) + practical.

Best for: students not planning A-Level or IB Biology.

Extended tier

Core + Supplement content

A* A B C D E F G

Grades A* to G. Papers: 2 (MC) + 4 (theory) + practical.

Best for: anyone targeting top grades or planning A-Level / IB Biology.

The Supplement carries most of the mechanistic biology, how a synapse works, how the nephron filters blood, how eutrophication unfolds step by step, how a gene is expressed as a protein. This is the material that A-Level Biology assumes from day one. Any student intending to study Biology, Chemistry or Medicine beyond IGCSE should follow the Extended tier.

The Exams

Exam format

All candidates take three papers: a multiple-choice paper, a theory paper, and one practical paper. The tier determines which multiple-choice and theory papers a student sits.

Paper	Type	Duration	Marks	Weight
Paper 1 (Core)	Multiple Choice	45 min	40	30%
Paper 2 (Extended)	Multiple Choice	45 min	40	30%
Paper 3 (Core)	Theory, short answer & structured	1 h 15 min	80	50%
Paper 4 (Extended)	Theory, short answer & structured	1 h 15 min	80	50%
Paper 5 (all)	Practical Test (lab)	1 h 15 min	40	20%
Paper 6 (all)	Alternative to Practical (written)	1 h	40	20%

Core candidates sit Papers 1 + 3 + (5 or 6). Extended candidates sit Papers 2 + 4 + (5 or 6). Every candidate takes one practical paper, either Paper 5 or Paper 6, not both. The multiple-choice paper has 40 compulsory four-option items with no negative marking. Calculators are allowed in all parts of the exam. All papers are externally assessed, there is no coursework.

The practical paper: Paper 5 vs Paper 6

20% of the grade is decided here, and it is the component most often under-prepared. Cambridge is explicit that both options test the same skills and the same experimental contexts, the only difference is that Paper 5 candidates perform experiments in a laboratory, while Paper 6 candidates answer written questions about experimental situations.

Critical point

Choosing Paper 6 does not reduce what a student needs to know. A student sitting Paper 6 still needs genuine practical experience, because the questions assume it. Paper 6 is not easier, it just moves the experiment from the bench to a written description.

The practical contexts students must know include: diffusion and osmosis; food tests and enzyme rates; photosynthesis; transpiration; respiration in yeast; sampling methods; observing and drawing biological specimens; calculating magnification; and simple quantitative measurement of volumes, masses, temperatures, times and lengths. The four assessed skill areas are: planning (variables, controls, ranges, predictions), recording (tables, units, precision), processing and presenting (graphs, calculations, best-fit lines), and interpreting and evaluating (conclusions, anomalies, sources of error, improvements).

Presentation conventions are examinable

Column headings must separate quantity and unit with a solidus (e.g. time / s). Graph points are crosses or encircled dots, plotted to half a small square. A best-fit line is a single thin smooth line ignoring anomalous points. Drawings use a sharp pencil, fine unbroken lines, no shading, and ruled label lines that touch the feature labelled. These are free marks for students taught them, and quiet losses for those who aren’t.

The Syllabus

All 21 topics

Cambridge IGCSE Biology is organised into 21 topics. All candidates study all 21; Extended students add the Supplement content within each. Click any topic to see the full content.

All students cover

The seven characteristics of living organisms: movement, respiration, sensitivity, growth, reproduction, excretion and nutrition, each with a precise definition
Classification into groups by shared features; the definition of a species; the binomial system; constructing and using dichotomous keys
Main features of the animal and plant kingdoms; the five vertebrate groups (mammals, birds, reptiles, amphibians, fish) and four arthropod groups (myriapods, insects, arachnids, crustaceans)