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IB IGCSE AS & A Level Overview Topics Revision Ladder Teacher help BIOLOGY HL · Learning hub
Biology HL About this subject HL-only depth across the same four current themes: nucleic acids, metabolism and photosynthesis, plant and animal physiology, and population genetics. Selected topics only, not full syllabus coverage.
Topics & subtopics 01 Theme A: Unity and diversity (HL) HL-only depth on nucleic acid structure and the mechanisms and evidence behind speciation.
A1.1 Water A1.2 Nucleic acids A2.1 Origins of cells [HL] A2.2 Cell structure A2.3 Viruses [HL] A3.1 Diversity of organisms A3.2 Classification and cladistics [HL] A4.1 Evolution and speciation A4.2 Conservation of biodiversity 17 questions Review and practise → 02 Theme B: Form and function (HL) HL-only depth on plant transport, environmental adaptation, and muscle and kidney structure and function.
B1.1 Carbohydrates and lipids B1.2 Proteins B2.1 Membranes and membrane transport B2.2 Organelles and compartmentalization B2.3 Cell specialization B3.1 Gas exchange B3.2 Transport B3.3 Muscle and motility [HL] B4.1 Adaptation to environment B4.2 Ecological niches 17 questions Review and practise → 03 Theme C: Interaction and interdependence (HL) HL-only depth on chemiosmosis, cell respiration, photosynthesis, chemical signalling and immune defence.
C1.1 Enzymes and metabolism C1.2 Cell respiration C1.3 Photosynthesis C2.1 Chemical signaling [HL] C2.2 Neural signaling C3.1 Integration of body systems C3.2 Defense against disease C4.1 Populations and communities C4.2 Transfers of energy and matter 18 questions Review and practise → 04 Theme D: Continuity and change (HL) HL-only depth on DNA replication, gene expression, mutation, meiosis, inheritance, population genetics and hormonal homeostasis.
D1.1 DNA replication D1.2 Protein synthesis D1.3 Mutation and gene editing D2.1 Cell and nuclear division D2.2 Gene expression [HL] D2.3 Water potential D3.1 Reproduction D3.2 Inheritance D3.3 Homeostasis D4.1 Natural selection D4.2 Stability and change D4.3 Climate change 23 questions Review and practise → Structured progression
Revision Ladder Start with foundations, then move through application and challenge. Stages use activity marks and complexity.
Stage 1 Foundation Recall core ideas and establish reliable methods.
39 questions available 0/39 completed Start stage → Stage 2 Apply Connect concepts and apply them in exam-style contexts.
36 questions available 0/36 completed Start stage → Stage 3 Challenge Tackle advanced reasoning and multi-step questions.
Coming soon Progress dashboard
Topic practice Recommended next: Theme A: Unity and diversity (HL)
01
Theme A: Unity and diversity (HL) Not started HL-only depth on nucleic acid structure and the mechanisms and evidence behind speciation.
0% 0/34 complete →
02
Theme B: Form and function (HL) Not started HL-only depth on plant transport, environmental adaptation, and muscle and kidney structure and function.
0% 0/34 complete →
03
Theme C: Interaction and interdependence (HL) Not started HL-only depth on chemiosmosis, cell respiration, photosynthesis, chemical signalling and immune defence.
0% 0/36 complete →
04
Theme D: Continuity and change (HL) Not started HL-only depth on DNA replication, gene expression, mutation, meiosis, inheritance, population genetics and hormonal homeostasis.
0% 0/46 complete →
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This is unofficial practice under accuracy, provenance, and rights review. Use the latest official subject guide to confirm syllabus coverage and examination requirements.
