Biology (First Assessment 2025) Topic 1 - Cells 1.1 (A.2.2) | Cell Structure Biology-2026 | Topic-1 | 1.2 (B.2.2) | Organelles and compartmentalization Biology-2026 | Topic-1 | 1.3 (B.2.1) | Membranes and membrane transport Biology-2026 | Topic-1 | 1.4 (B.2.3) | Cell specialization Biology-2026 | Topic-1 | 1.5 (D.2.1) | Cell and nuclear division Biology-2026 | Topic-1 | 1.6 (A.2.1) | Origins of cells [HL] Biology-2026 | Topic-1 | 1.7 (A.2.3) | Viruses [HL] Biology-2026 | Topic-1 | Topic 2 - Water 2.1 (a1.1) | Water Biology-2026 | Topic-2 | 2.1 (d2.3) | WATER POTENTIAL Biology-2026 | Topic-2 | Topic 3 - Organic compounds 3.1 (B1.1) | Carbohydrates and lipids Biology-2026 | Topic-3 | 3.2 (B.1.2) | Proteins Biology-2026 | Topic-3 | 3.3 (C.1.1) | Enzymes and metabolism Biology-2026 | Topic-3 | Topic 4 - Nucleic acids 4.1 (A1.2) | Nucleic acids (plus HL) Biology-2026 | Topic-4 | 4.2 (D1.1) | DNA replication (plus HL) Biology-2026 | Topic-4 | 4.3 (D1.2) | Protein synthesis (plus HL) Biology-2026 | Topic-4 | Topic 5 - Genetics 5.1 (D2.1.9) | Meiosis Biology-2026 | Topic-5 | 5.2 (D3.2) | Inheritance (plus HL) Biology-2026 | Topic-5 | 5.3 (D1.3) | Mutation and gene editing (plus HL) Biology-2026 | Topic-5 | 5.4 (D2.2) | Gene expression [HL] Biology-2026 | Topic-5 | Topic 6 - Ecology 6.1 (B4.1) | Adaptation to environment Biology-2026 | Topic-6 | 6.2 (D4.3) | Climate change (plus HL) Biology-2026 | Topic-6 | 6.3 (B4.2) | Ecological niches Biology-2026 | Topic-6 | 6.4 (A.3.1) | Diversity of organisms (plus HL) Biology-2026 | Topic-6 | 6.5 (A.4.2) | Conservation of biodiversity Biology-2026 | Topic-6 | 6.6 (C4.1) | Populations and communities Biology-2026 | Topic-6 | 6.7 (D4.2) | Stability and change (plus HL) Biology-2026 | Topic-6 | 6.8 (C4.2) | Transfers of energy and matter Biology-2026 | Topic-6 | Topic 7 - Evolution 7.1 (D4.1) | Natural selection (plus HL) Biology-2026 | Topic-7 | 7.2 (A4.1) | Evolution and speciation (plus HL) Biology-2026 | Topic-7 | 7.3 (A.3.2) | Classification and cladistics (HL only) Biology-2026 | Topic-7 | Topic 8 - Animal Physiology 8.1 (D.3.1) | Reproduction Biology-2026 | Topic-8 | 8.2 (B.3.2) | Transport Biology-2026 | Topic-8 | 8.3 (B.3.1) | Gas exchange Biology-2026 | Topic-8 | 8.4 (C.3.2) | Defense against disease Biology-2026 | Topic-8 | 8.5 (D.3.3) | Homeostasis Biology-2026 | Topic-8 | 8.6 (C.2.2) | Neural signaling Biology-2026 | Topic-8 | 8.7 (B.3.3) | Muscle and motility [HL] Biology-2026 | Topic-8 | 8.8 (C.2.1) | Chemical signaling [HL] Biology-2026 | Topic-8 | 8.9 (C3.1) | Integration of body systems Biology-2026 | Topic-8 | Topic 9 - Plant Physiology 9.1 (D3.1) | Reproduction in Plants Biology-2026 | Topic-9 | 9.2 (B3.2) | Transport Biology-2026 | Topic-9 | 9.3 (B3.1) | Gas exchange Biology-2026 | Topic-9 | 9.4 (B3.2) | Transport [HL] Biology-2026 | Topic-9 | 9.5 (C.3.1) | Integration of Systems [HL] Biology-2026 | Topic-9 |
