Cambridge IGCSE Biology Syllabus Guide (0610)
Complete breakdown of all 389 learning objectives for the 2023-2025 syllabus, with Core vs Supplement topics and study strategies
The Cambridge IGCSE Biology syllabus contains 389 learning objectives across 21 topics - the most of any science subject. This guide breaks down exactly what you need to know for Core and Supplement (Extended) tiers.
Biology is unique among the sciences: it has the most content to learn, requires accurate diagrams, and demands clear written explanations. From cells to ecosystems, from DNA to evolution, the scope is vast.
The key to managing this breadth? Understanding the syllabus structure. It shows you which topics carry the most weight (hint: coordination, reproduction, and genetics together make up 30%), which areas are Supplement-only, and how topics connect to each other.
This guide gives you the complete picture - so you can focus your revision where it matters most. Ready to practice? Try our IGCSE Biology past papers.
First: Know Your Tier - Core vs Extended
Before diving into the syllabus, you must understand the tier system. Cambridge IGCSE Biology offers two levels of difficulty, and you need to know which one you're taking.
Core Tier
Papers 1, 3, 5
- 235 learning objectives
- Grades available: C to G
- Foundational concepts
- Descriptive understanding
- Basic diagrams and labelling
- Straightforward explanations
Extended Tier
Papers 2, 4, 6
- 389 learning objectives (all Core + 154 more)
- Grades available: A* to E
- Advanced concepts
- Detailed mechanisms
- Complex diagrams
- In-depth explanations
Important
Your school or exam centre decides which tier you take. If you're aiming for grades A*-B, you must take Extended. Core tier caps at grade C.
Check with your teacher if you're unsure which tier you're registered for.
The 21 Topics: Syllabus Overview
IGCSE Biology covers the broadest range of topics among the sciences. It's organized into 5 main sections: Characteristics of life and cells, Organisation of the organism (nutrition, transport, respiration), Movement and coordination, Reproduction and inheritance, and Ecology. The syllabus progresses from microscopic (cells, molecules) to macroscopic (ecosystems, human impact).
Here's how the learning objectives break down across the major topics:
| Unit | Topic | Core | Supp | Total | % |
|---|---|---|---|---|---|
| 14 | Coordination and response | 20 | 18 | 38 | 10% |
| 16 | Reproduction | 27 | 11 | 38 | 10% |
| 17 | Chromosomes, genes and proteins | 16 | 21 | 37 | 10% |
| 19 | Energy flow in ecosystems | 23 | 8 | 31 | 8% |
| 9 | Circulatory systems | 14 | 14 | 28 | 7% |
| 7 | Diet and nutrition | 18 | 7 | 25 | 6% |
| 20 | Food supply | 14 | 6 | 20 | 5% |
| 18 | Variation and selection | 13 | 6 | 19 | 5% |
| Other topics (13 smaller units) | 90 | 63 | 153 | 39% | |
| TOTAL | 235 | 154 | 389 | 100% | |
Supplement-Heavy Topics
Some topics have significant Supplement-only content - Core students can skip these:
- Unit 17: Chromosomes, genes and proteins - 21 Supplement objectives (57%)
- Unit 10: Diseases and immunity - 12 Supplement objectives (71%)
- Unit 14: Coordination and response - 18 Supplement objectives (47%)
Reference: Cambridge IGCSE Biology (0610) Official Page
Key Insight: The Big Three + Genetics
The top 3 units account for 30% of all learning objectives:
- Coordination and response (10%) - nerves, hormones, eyes, reflexes
- Reproduction (10%) - asexual, sexual, plant and human reproduction
- Chromosomes and genetics (10%) - DNA, genes, inheritance, genetic engineering
These topics are conceptually linked and often examined together. Start practicing with our IGCSE Biology topic quizzes.
Learning Objectives by Topic (Visual)
Bar length shows total objectives. Color split shows Core vs Supplement.
13 smaller topics (153 objectives total) not shown individually.
What Makes Biology Different
Biology differs from Physics and Chemistry in several key ways:
More Content, Less Calculation
389 objectives vs 326 (Physics) and 255 (Chemistry). Biology has the most content to learn but fewer mathematical calculations.
Diagrams Are Crucial
You must draw and label biological diagrams accurately - cells, organs, systems, food webs. Practice these regularly.
Interconnected Topics
Topics link together - photosynthesis connects to food chains, which connects to ecosystems, which connects to human impact.
Extended Writing
Biology requires more written explanations than the other sciences. Practice explaining processes clearly and completely.
Recommended Study Approach
Start with Cells and Molecules
Cell structure, biological molecules, and enzymes are foundational. Everything else builds on this understanding.
Master the Human Body Systems
Digestion, circulation, respiration, excretion, nervous system - these form a large chunk of the syllabus and are heavily examined.
Don't Skip Plant Biology
Photosynthesis, transport in plants, and plant reproduction are often neglected but appear in every exam. Learn them thoroughly.
Practice Drawing Diagrams
Cell structures, heart, eye, kidney nephron, leaves - you need to draw these accurately under exam conditions.
Connect Genetics to Real Applications
DNA, inheritance, genetic engineering, and selective breeding are increasingly important. Understand the principles and applications.
Use Past Papers to Find Gaps
Practice with IGCSE Biology past papers to identify topics you struggle with, then target those specifically.
Key Takeaways
- 389 total objectives - 235 Core, 154 Supplement-only (largest science syllabus)
- Three big topics - Coordination, Reproduction, and Genetics make up 30%
- Know your tier - Core caps at grade C; Extended required for A*-B
- Diagrams matter - Practice drawing and labelling biological structures
- Topics interconnect - Understanding one topic helps with others
Frequently Asked Questions
Do exam questions follow this topic distribution?
There's no guarantee. While topics with more objectives tend to appear more often, Cambridge can emphasize any topic in a given year. One paper might focus heavily on ecology, another on human reproduction. The syllabus distribution is a rough guide, not a prediction. Biology's 21 topics mean variety is high - don't skip anything. The safest approach: cover all topics, but allocate more revision time to larger ones. Check past papers to see how questions actually vary year to year.
Is IGCSE Biology mostly memorization?
There's significant content to learn, but understanding is more important than pure memorization. If you understand why a process works (like how the heart pumps blood), you can reconstruct the details. Focus on understanding mechanisms, then the facts follow naturally.
Which diagrams do I need to draw from memory?
Key diagrams include: animal and plant cells, the heart, the eye, leaf cross-section, kidney nephron, the digestive system, and various cycles (carbon, nitrogen, water). Practice these until you can draw them accurately and quickly.
How do I handle extended writing questions?
Structure your answer clearly: state the process, explain each step, mention the purpose. Use key terms from the syllabus. For "explain" questions, always give the reason why something happens, not just what happens.
Related Syllabus Guides
IGCSE Physics (0625)
326 learning objectives across 6 topics. More calculations - understand the equations, don't just memorize.
IGCSE Chemistry (0620)
255 learning objectives across 12 topics. Organic chemistry (20%) and mole calculations are key.
Official Resources
This guide is based on the Cambridge IGCSE Biology (0610) syllabus for examination from 2023-2025. Always refer to the official Cambridge syllabus for the most current information.