IBBiologyHLInteraction & Interdependence

Interaction & Interdependence (HL IB Biology)

Get ready for your HL IB Biology exams with our revision resources. Find everything you need to revise this topic, so you can go into your exam confident and prepared. Teachers and examiners write all our resources, and they’re designed specifically for each exam board. We regularly update them to match the latest syllabus, so you’ll only revise the most accurate, up-to-date information. Explore the collection below to get started.

Enzymes & Metabolism

  1. Metabolism: Enzymes & Reactions
  2. Enzyme Action
  3. Enzyme Activity: Skills
  4. Enzyme Reaction Rates: Skills
  5. Activation Energy: Skills
  6. Metabolic Pathways (HL)
  7. Enzyme Inhibition (HL)

Cell Respiration

  1. Adenosine Triphosphate (ATP)
  2. Cell Respiration
  3. Cell Respiration: Skills
  4. Oxidation & Reduction (HL)
  5. Glycolysis (HL)
  6. Anaerobic Respiration (HL)
  7. The Link Reaction & The Krebs Cycle (HL)
  8. Oxidative Phosphorylation (HL)
  9. Respiratory Substrates (HL)

Photosynthesis

  1. The Process of Photosynthesis
  2. Separating Photosynthetic Pigments: Skills
  3. Absorption Spectra
  4. Absorption & Action Spectra: Skills
  5. Limiting Factors of Photosynthesis: Skills
  6. Carbon Dioxide Enrichment Experiments
  7. Photosystems (HL)
  8. Light Dependent Reactions (HL)
  9. Photophosphorylation (HL)
  10. Light Independent Reactions (HL)
  11. Interdependence of Photosynthetic Reactions (HL)

Chemical Signalling

  1. Cell Signalling (HL)
  2. Signalling Molecules (HL)
  3. Receiving the Signal (HL)
  4. Transmembrane Receptors (HL)
  5. Epinephrine Receptors (HL)
  6. Intracellular Receptors (HL)
  7. Regulating Cell Signalling (HL)

Neural Signalling

  1. Neurones: Function & Structure
  2. Nerve Impulses
  3. Nerve Impulses: Skills
  4. Synapses
  5. Action Potentials (HL)
  6. Interpreting Oscilloscope Traces: Skills (HL)
  7. Nerve Conduction Velocity (HL)
  8. Synaptic Transmission (HL)
  9. Neurones in the Brain (HL)

Integration of Body Systems

  1. Integration in Living Organisms
  2. The Nervous System
  3. Reflex Arc & Movement Control
  4. Epinephrine & Melatonin
  5. Control Mechanisms
  6. Observing Tropic Responses: Skills (HL)
  7. Phototropism (HL)
  8. Plant Hormones (HL)
  9. Regulating Plant Growth & Fruit Ripening (HL)

Defence Against Disease

  1. Pathogens
  2. Barriers to Pathogens: Skin & Mucous Membranes
  3. Blood Clotting
  4. The Immune System
  5. White Blood Cells
  6. Adaptive Immune Response
  7. HIV & AIDS
  8. Antibiotics
  9. Antibiotic Resistance
  10. Zoonoses
  11. Vaccines & Immunity
  12. Evaluating COVID-19 Data: Skills

Populations & Communities

  1. Populations in Ecosystems
  2. Estimating Population Size
  3. Limiting Population Size
  4. Limiting Population Size: Examples
  5. Population Growth Curves: Skills
  6. Populations: Intraspecific Relationships
  7. Community: Interspecific Relationships
  8. Interspecific Competition
  9. Chi-Squared Test: Skills

Transfer of Energy & Matter

  1. Ecosystems as Open Systems
  2. Energy Flow in Ecosystems
  3. Obtaining Carbon Compounds in Ecosystems
  4. Trophic Levels
  5. Pyramids of Energy: Skills
  6. Energy Losses
  7. Primary & Secondary Production
  8. The Carbon Cycle
  9. Nutrient Cycling

Enzymes & Metabolism

  1. Multiple Choice Questions
  2. Structured Questions

Cell Respiration

  1. Multiple Choice Questions
  2. Structured Questions

Photosynthesis

  1. Multiple Choice Questions
  2. Structured Questions

Chemical Signalling

  1. Multiple Choice Questions
  2. Structured Questions

Neural Signalling

  1. Multiple Choice Questions
  2. Structured Questions

Integration of Body Systems

  1. Multiple Choice Questions
  2. Structured Questions

Defence Against Disease

  1. Multiple Choice Questions
  2. Structured Questions

Populations & Communities

  1. Multiple Choice Questions
  2. Structured Questions

Transfer of Energy & Matter

  1. Multiple Choice Questions
  2. Structured Questions