CIE IGCSE Biology Core Topic Question Past paper and exam-style questions organised by topic, with student-friendly answers written by teachers and examiners. 1. Characteristics & Classification of Living Organisms 1.1 Characteristics, Classification & Features of Organisms 2. Organisation of the Organism 2.1 Cell Structure & Size of Specimens 3. Movement into & out of Cells 3.1 Diffusion, Osmosis & Active Transport 4. Biological Molecules 4.1 Biological Molecules 5. Enzymes 5.1 Enzymes 6. Plant Nutrition 6.1 Photosynthesis & Leaf Structure 7. Human Nutrition 7.1 Human Diet & Digestion 8. Transport in Plants 8.1 Transport in Plants 9. Transport in Animals 9.1 Circulatory Systems, Heart & Blood Vessels 10. Diseases & Immunity 10.1 Diseases & Immunity 11. Gas Exchange in Humans 11.1 Gas Exchange in Humans 12. Respiration 12.1 Respiration 13. Excretion in Humans 13.1 Excretion in Humans 14. Coordination & Response 14.1 Coordination, Response & Homeostasis 15. Drugs 15.1 Drugs in Medicine 16. Reproduction 16.1 Reproduction in Plants & Humans 17. Inheritance 17.1 Inheritance, Genes & Cell Division 18. Variation & Selection 18.1 Variation & Natural Selection 19. Organisms & Their Environment 19.1 Energy & Feeding Relationships 20. Human Influences on Ecosystems 20.1 Human Impact: Biodiversity, Pollution & Conservation 21. Biotechnology & Genetic Modification 21.1 Biotechnology & Genetic Modification