Every IGCSE Biology student hits the same wall near exam time: there is a lot to remember, and it is scattered across folders, textbooks and half-finished notes. Knowledge organisers fix that. Each one takes a single topic and lays out everything that matters — key vocabulary, the core ideas, the diagrams, the explanations and the common exam mistakes — on one side of A4.

This is a complete set for the Edexcel IGCSE Biology specification (4BI1): 22 topics, one page each, free to download below. They are built for active revision rather than just reading — every sheet ends with a cover-and-quiz section so students test themselves instead of skimming.

Use them however suits you — print a stack for the class, set one as homework, hand them out before a test, or send the link to students for independent revision. No sign-up and no catch: just click and download.

On every organiser: key vocabulary · core content and diagrams · the ‘why’ behind the biology · common exam mistakes · self-check questions.

Section 1 — Nature & Variety of Living Organisms

• 1.1 Characteristics of Living Organisms
• 1.2 Variety of Living Organisms

Section 2 — Structures & Functions in Living Organisms

• 2.1 Levels of Organisation
• 2.2 Cell Structure
• 2.3 Biological Molecules
• 2.4 Movement of Substances In & Out of Cells
• 2.5 Nutrition
• 2.6 Respiration
• 2.7 Gas Exchange
• 2.8 Transport
• 2.9 Excretion
• 2.10 Co-ordination & Response

Section 3 — Reproduction & Inheritance

• 3.1 Reproduction
• 3.2 Inheritance

Section 4 — Ecology & the Environment

• 4.1 The Organism in the Environment
• 4.2 Feeding Relationships
• 4.3 Cycles within Ecosystems
• 4.4 Human Influences on the Environment

Section 5 — Use of Biological Resources

• 5.1 Food Production
• 5.2 Selective Breeding
• 5.3 Genetic Modification
• 5.4 Cloning

More free science resources

That is the full specification covered. If these are useful, take a look around the rest of practical-science.com — there are step-by-step laboratory practicals for IGCSE, GCSE and IB Science, plus a complete set of Chemistry knowledge organisers, all free to use in the classroom.

• Practical Science
• Study Skills