CIE IGCSE Biology Revision Notes
Our CIE iGCSE Biology revision notes are here to provide you with clear explanations of concepts, examples and diagrams so that you fully understand even the most difficult of areas. They have been split into topics to make it easier to find the concepts you really want to revise.
CIE IGCSE 1 Characteristics and classification of living organisms
CIE IGCSE 2 Organisation of the organism
Transport in Plants – How Plants are Adapted for Photosynthesis (GCSE Biology)
Enzymes & Digestion – Cell Organisation (GCSE Biology)
Microscopes & Cultures – Cell Size and Area Estimations (GCSE Biology)
Microscopes & Cultures – Magnification and Unit Conversions (GCSE Biology)
Introduction to Cells – Specialised Cells: More Cells (GCSE Biology)
Introduction to Cells – Specialised Cells: Sperm Cells (GCSE Biology)
Introduction to Cells – Animal and Plant Cells (GCSE Biology)
CIE IGCSE 3 Movement in and out of cells
Simple Molecular Covalent Structures (GCSE Chemistry)
Exchange Surfaces – Surface Areas to Volume Ratios (GCSE Biology)
Transport in Cells – Diffusion – (GCSE Biology)
Transport in Cells – Active Transport (GCSE Biology)
Transport in Cells – Measuring the Effects of Osmosis (GCSE Biology)
Transport in Cells – Osmosis (GCSE Biology)
Transport in Cells – Factors that Affect the Rate of Diffusion (GCSE Biology)
CIE IGCSE 4 Biological molecules
CIE IGCSE 5 Enzymes
CIE IGCSE 6 Plant nutrition
Plant Disease & Defence – Plant Diseases and Deficiencies (GCSE Biology)
Photosynthesis: Greenhouses – (GCSE Biology)
Photosynthesis: Limiting Factors Affecting the Rate of Photosynthesis – (GCSE Biology)
Photosynthesis: An Introduction – (GCSE Biology)
Transport in Plants – How Plants are Adapted for Photosynthesis (GCSE Biology)
Transport in Plants – Structure of a Plant (GCSE Biology)
CIE IGCSE 7 Human nutrition
Types of Diseases – Bacterial Diseases: Cholera and Tuberculosis – (GCSE Biology)
Lifestyle & Disease – Diet and Exercise (GCSE Biology)
Enzymes & Digestion – The Digestive System (GCSE Biology)
Enzymes & Digestion – Protein and Lipids: Breakdown (GCSE Biology)
Enzymes & Digestion – Carbohydrates: Breakdown and Synthesis (GCSE Biology)
Exchange Surfaces – Exchange Surfaces: Increasing their Effectiveness (GCSE Biology)
CIE IGCSE 8 Transport in plants
Transpiration – Plant Water Loss (GCSE Biology)
Transpiration – Transpiration Rates (GCSE Biology)
Transpiration – Transpiration in Plants (GCSE Biology)
Transport in Plants – Structure of a Plant (GCSE Biology)
Transport in Plants – Transport Systems in Plants (GCSE Biology)
Exchange Surfaces – Exchange Surfaces: Increasing their Effectiveness (GCSE Biology)
CIE IGCSE 9 Transport in animals
Cardiovascular Disease: Prophylactic Treatment (GCSE Biology)
Cardiovascular Disease: Artificial Hearts and Transplants (GCSE Biology)
Cardiovascular Disease: Stents and Lifestyle (GCSE Biology)
Blood and Blood Vessels: Veins and Capillaries (GCSE Biology)
Blood and Blood Vessels – White Blood Cells and Platelets (GCSE Biology)
Blood and Blood Vessels – Plasma and Red Blood Cells (GCSE Biology)
Blood and Blood Vessels – Arteries (GCSE Biology)
The Circulatory System – Heart: Structure and Function (GCSE Biology)
Circulatory System – The Double Circulatory System (GCSE Biology)
Circulatory System – The Single Circulatory System (GCSE Biology)
CIE IGCSE 10 Diseases and immunity
Disease Prevention – Human Disease Prevention Systems (GCSE Biology)
The Immune System – Memory of the Immune System (GCSE Biology)
The Immune System – Vaccination (GCSE Biology)
The Immune System – The Role of Antibodies and Antitoxins – (GCSE Biology)
The Immune System – The Immune System and Phagocytosis (GCSE Biology)
Pathogens, Disease and Transmission – Preventing Transmission of Disease (GCSE Biology)
Pathogens, Disease and Transmission – Transmission of Disease (GCSE Biology)
Pathogens, Disease and Transmission – Pathogens Leading to Disease (GCSE Biology)
CIE IGCSE 11 Gas exchange in humans
CIE IGCSE 12 Respiration
CIE IGCSE 13 Excretion in humans
CIE IGCSE 14 Coordination and response
Plant Hormones – Commercial Use of Plant Hormones (GCSE Biology)
Plant Hormones – Experiments on Plant Responses (GCSE Biology)
Plant Hormones – Tropisms: Phototropism & Geotropism (GCSE Biology)
Control of Blood Glucose Concentration – Diabetes Mellitus: Type I & II (GCSE Biology)
Control of Blood Glucose Concentration – Increasing and Decreasing Blood Glucose Levels (GCSE Biology)
Control of Blood Glucose Concentration – Blood Glucose Homeostasis (GCSE Biology)
Homeostasis – Increasing and Decreasing Body Temperature (GCSE Biology)
Homeostasis – An Introduction (GCSE Biology)
Homeostasis – Thermoregulation (GCSE Biology)
Human Endocrine System – Hormones: Adrenaline and Thyroxine (GCSE Biology)
CIE IGCSE 15 Drugs
Antibiotics – Drug Resistance, Antivirals and Antiseptics (GCSE Biology)
Antibiotics – Drugs: Antibiotics and Painkillers (GCSE Biology)
Lifestyle & Disease – Effects of Smoking and Alcohol on Health (GCSE Biology)
CIE IGCSE 16 Reproduction
Asexual and Sexual Reproduction – Sexual Reproduction: Pros and Cons (GCSE Biology)
Asexual and Sexual Reproduction – Asexual Reproduction: Pros and Cons (GCSE Biology)
Asexual and Sexual Reproduction – (GCSE Biology)
Treating Infertility – IVF: Development and Treatment Issues (GCSE Biology)
Treating Infertility – Drugs, IVF and AI for Infertility (GCSE Biology)
Contraception – Hormonal Contraception: The Pill, Patches & Implants (GCSE Biology)
Contraception – Contraception and Non-Hormonal Contraception (GCSE Biology)
Hormones in Human Reproduction – The Menstrual Cycle: Graphs (GCSE Biology)
Hormones in Human Reproduction – The Menstrual Cycle: Hormonal Interactions (GCSE Biology)
Hormones in Human Reproduction – The Menstrual Cycle: Hormones (GCSE Biology)
CIE IGCSE 17 Inheritance
Meiosis – Mitosis and Meiosis (GCSE Biology)
Inheritance – Sex Determination (GCSE Biology)
Inheritance – Genetic Diagrams (GCSE Biology)
Inheritance – Genes and Inheritance (GCSE Biology)
DNA – Protein Synthesis: Translation (GCSE Biology)
DNA – An Introduction (GCSE Biology)
Cell Division – Stem Cell Types (GCSE Biology)
Cell Division – The Cell Cycle and Mitosis (GCSE Biology)
Cell Division – Nucleus and Chromosomes (GCSE Biology)
CIE IGCSE 18 Variation and selection
Ecosystems – Extremophiles (GCSE Biology)
Ecosystems – Adaptations (GCSE Biology)
Development and Understanding of Evolution – Evidence for Evolution: Resistant Bacteria (GCSE Biology)
Variation – Selective Breeding (GCSE Biology)
Variation – Evolution and Natural Selection (GCSE Biology)
Variation – Variation and Its Causes (GCSE Biology)
Inheritance – Inherited Disorders (GCSE Biology)
DNA – Mutations (GCSE Biology)
CIE IGCSE 19 Organisms and their environment
REARRANGED ORDER – Deforestation (GCSE Biology)
REARRANGED ORDER – Pollution and Global Warming (GCSE Biology)
Biodiversity – Human Population & Increasing Waste (GCSE Biology)
Cycles – Decomposition & The Nitrogen Cycle (GCSE Biology)
Cycles – The Water Cycle (GCSE Biology)
Cycles – Cycles & The Carbon Cycle (GCSE Biology)
Organisation & Trophic Levels – Transfer of Biomass (GCSE Biology)
Organisation & Trophic Levels – Pyramids of Biomass (GCSE Biology)
Organisation & Trophic Levels – Trophic Levels & Food Chains (GCSE Biology)
Ecosystems – Biotic Factors (GCSE Biology)
CIE IGCSE 20 Biotechnology and genetic engineering
CIE IGCSE 21 Human influences on ecosystems
Food Security – Sustainable Fisheries (GCSE Biology)
Food Security – Farming Techniques (GCSE Biology)
Food Security – Food Production & Security (GCSE Biology)
REARRANGED ORDER – Mainatining Bioversity (GCSE Biology)
REARRANGED ORDER – Deforestation (GCSE Biology)
REARRANGED ORDER – Land Use & Destruction of Peat Bogs (GCSE Biology)
REARRANGED ORDER – Pollution and Global Warming (GCSE Biology)
Biodiversity – (GCSE Biology)
FAQs
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How do I use the CIE iGCSE Biology revision notes?
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Should I write my own CIE iGCSE Biology revision notes?
While it is important to not just passively read textbooks or watch videos (as you don't retain the information well), it is equally important not to just write out notes for the sake of it. Actively engage in your revision by adding to notes or making flashcards as it will help you to remember the content more effectively.
Is the CIE iGCSE Biology exam hard?
The difficulty of the iGCSE Biology exam stems from the amount of content that you will need to memorise. Compared to Physics and Chemistry, it relies less on the application of concepts but more on information retention. With a comprehensive study schedule and time to recap topics, you can succeed in your exams.
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