IB Biology Study Guide and Notes for SL/HL (2020-2021)

IB Biology Detailed Topic-Wise Study Notes

Excellent Study Notes for IB DP Biology Prepared by Subject Matter Experts.

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  • Cross-cutting concepts
  • Recurring ideas that apply to many different standards

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  • Actionable language (“I can” statements)
  • Mapped to daily notes so that students can assess their understanding after each lesson and know where to find the information if there is something they need to review.

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Topic 4: Ecology

  • 4.1 Species, communities and ecosystems
  • 4.2 Energy flow
  • 4.3 Carbon cycling
  • 4.4 Climate change

Topic 5: Evolution and biodiversity

  • 5.1 Evidence for evolution
  • 5.2 Natural selection
  • 5.3 Classification of biodiversity
  • 5.4 Cladistics

Topic 6: Human physiology

  • 6.1 Digestion and absorption
  • 6.2 The blood system
  • 6.3 Defence against infectious disease
  • 6.4 Gas exchange
  • 6.5 Neurons and synapses
  • 6.6 Hormones, homeostasis and reproduction

Additional Higher Level (AHL) Topics

Topic 7: Nucleic acids

  • 7.1 DNA structure and replication
  • 7.2 Transcription and gene expression
  • 7.3 Translation

Topic 8: Metabolism, cell respiration and photosynthesis

  • 8.1 Metabolism
  • 8.2 Cell respiration
  • 8.3 Photosynthesis

Topic 9: Plant biology

  • 9.1 Transport in the xylem of plants
  • 9.2 Transport in the phloem of plants
  • 9.3 Growth in plants
  • 9.4 Reproduction in plants

Topic 10: Genetics and evolution

  • 10.1 Meiosis
  • 10.2 Inheritance
  • 10.3 Gene pools and speciation

Topic 11: Animal physiology

  • 11.1 Antibody production and vaccination
  • 11.2 Movement
  • 11.3 The kidney and osmoregulation
  • 11.4 Sexual reproduction

Optional Topics

Option A: Neurobiology and behavior (Core topics)

  • A.1 Neural development
  • A.2 The human brain
  • A.3 Perception of stimuli

Option A: Neurobiology and behaviour (Additional higher level topics)

  • A.4 Innate and learned behaviour
  • A.5 Neuropharmacology
  • A.6 Ethology

Option B: Biotechnology and bioinformatics (Core topics)

  • B.1 Microbiology: organisms in industry
  • B.2 Biotechnology in agriculture
  • B.3 Environmental protection

Option B: Biotechnology and bioinformatics (Additional higher level topics)

  • B.4 Medicine
  • B.5 Bioinformatics

Option C: Ecology and conservation (Core topics)

  • C.1 Species and communities
  • C.2 Communities and ecosystems
  • C.3 Impacts of humans on ecosystems
  • C.4 Conservation of biodiversity

Option C: Ecology and conservation (Additional higher level topics)

  • C.5 Population ecology
  • C.6 Nitrogen and phosphorus cycles

Option D: Human physiology (Core topics)

  • D.1 Human nutrition
  • D.2 Digestion
  • D.3 Functions of the liver
  • D.4 The heart

Option D: Human physiology (Additional higher level topics)

  • D.5 Hormones and metabolism
  • D.6 Transport of respiratory gases

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