IB DP Biology Notes & Worksheets
Free IB Diploma Programme (DP) Biology revision notes for the 2025 syllabus, prepared by Fahad H. Ahmad and the Mega Lecture team. Notes cover Standard Level and Higher Level; HL material is flagged inside each booklet. Click any topic to open the PDF.
Theme A: Unity and Diversity
- 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
- A4.1 Evolution and Speciation
- A4.2 Conservation of Biodiversity
Worksheets
Theme B: Form 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
Worksheets
Theme C: Interaction and Interdependence
- C1.1 Enzymes and Metabolism
- C1.2 Cell Respiration
- C1.3 Photosynthesis
- C2.1 Chemical Signalling (HL)
- C2.2 Neural Signalling
- C3.1 Integration of Body Systems
- C3.2 Defence Against Infectious Disease
- C4.1 Populations and Communities
- C4.2 Transfers of Energy and Matter
Worksheets
Theme D: Continuity and Change
- 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
