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IB Diploma

IB Biology SL

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Unit 1Theme A — Unity and diversity11 lessonsUnit 2Theme B — Form and function13 lessonsUnit 3Theme C — Interaction and interdependence9 lessonsUnit 4Theme D — Continuity and change14 lessonsUnit 55. Tools10 lessonsUnit 66. Inquiry Process10 lessonsUnit 7Additional lessons142 lessons
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1

Theme A — Unity and diversity

11 lessons
  1. 1.1Theme A — Unity and diversityFree preview12 minStudy
  2. 1.2Tool 1: Experimental Techniques12 minStudy
  3. 1.3Tool 2: Technology12 minStudy
  4. 1.4Tool 3: Mathematics12 minStudy
  5. A1.1Water10 minStudy
  6. IB Biology SL A1.1 Water - Past paper MCQ
  7. A1.2Nucleic acids10 minStudy
  8. IB BIOLOGY SL - A1.2 Nucleic acids - MCQIB Biology SL A1.2 Nucleic acids - Past paper MCQ
  9. A2.1Origins of cells12 minStudy
  10. A2.1 Origins of cells – Exam questions
  11. A2.2Cell structure10 minStudy
  12. IB BIOLOGY SL - A2.2 Cell structure - MCQIB Biology SL A2.2 Cell structure - Past paper MCQ
  13. A3.1Diversity of organisms10 minStudy
  14. IB BIOLOGY SL - A3.1 Diversity of organisms - MCQIB Biology SL A3.1 Diversity of organisms - Past paper MCQ
  15. A4.1Evolution and speciation10 minStudy
  16. IB BIOLOGY SL - A4.1 Evolution and speciation - MCQIB Biology SL A4.1 Evolution and speciation - Past paper MCQ
  17. A4.2Conservation of biodiversity10 minStudy
  18. IB BIOLOGY SL - 20.4 Conservation — Past papers
2

Theme B — Form and function

13 lessons
  1. 2.1Theme B — Form and function12 minStudy
  2. B1.1Carbohydrates and lipids10 minStudy
  3. IB Biology SL B1.1 Carbohydrates and lipids - Past paper MCQIB BIOLOGY SL - B1.1 Carbohydrates and lipids - MCQ
  4. B1.2Proteins10 minStudy
  5. IB Biology SL B1.2 Proteins - Past paper MCQIB BIOLOGY SL - B1.2 Proteins - MCQ
  6. B2.1Membranes and membrane transport10 minStudy
  7. IB Biology SL B2.1 Membranes and membrane transport - Past …IB BIOLOGY SL - B2.1 Membranes and membrane transport - MCQ
  8. B2.2Organelles and compartmentalization10 minStudy
  9. IB BIOLOGY SL - B2.2 Organelles and compartmentalization - …IB Biology SL B2.2 Organelles and compartmentalization - Pa…
  10. B2.3Cell specialization10 minStudy
  11. IB Biology SL B2.3 Cell specialization - Past paper MCQIB BIOLOGY SL - B2.3 Cell specialization - MCQ
  12. B3.1Gas exchange10 minStudy
  13. IB Biology SL B3.1 Gas exchange - Past paper MCQIB BIOLOGY SL - B3.1 Gas exchange - MCQ
  14. B3.2Transport10 minStudy
  15. IB Biology SL B3.2 Transport - Past paper MCQIB BIOLOGY SL - B3.2 Transport - MCQ
  16. B4.1Adaptation to environment10 minStudy
  17. IB Biology SL B4.1 Adaptation to environment - Past paper M…IB BIOLOGY SL - B4.1 Adaptation to environment - MCQ
  18. B4.2Ecological niches10 minStudy
  19. IB BIOLOGY SL - B4.2 Ecological niches - MCQIB Biology SL B4.2 Ecological niches - Past paper MCQ
  20. 2.11Organelles & Compartmentalisation12 minStudy
  21. 2.12Cell Specialisation12 minStudy
  22. Cell Specialisation – Exam questions
  23. 2.13Neurones: Structure and Function12 minStudy
3

Theme C — Interaction and interdependence

9 lessons
  1. 3.1Theme C — Interaction and interdependence12 minStudy
  2. C1.1Enzymes and metabolism10 minStudy
  3. IB BIOLOGY SL - C1.1 Enzymes and metabolism - MCQIB Biology SL C1.1 Enzymes and metabolism - Past paper MCQ
  4. C1.2Cell respiration10 minStudy
  5. IB BIOLOGY SL - 12.1 Respiration — Past papersIB BIOLOGY SL - C1.2 Cell respiration - MCQIB Biology SL C1.2 Cell respiration - Past paper MCQ
  6. C1.3Photosynthesis10 minStudy
  7. IB BIOLOGY SL - C1.3 Photosynthesis - MCQIB BIOLOGY SL - 6.1 Photosynthesis — Past papersIB Biology SL C1.3 Photosynthesis - Past paper MCQ
  8. C2.2Neural signalling10 minStudy
  9. IB BIOLOGY SL - C2.2 Neural signalling - MCQIB Biology SL C2.2 Neural signalling - Past paper MCQ
  10. C3.1Integration of body systems10 minStudy
  11. IB BIOLOGY SL - C3.1 Integration of body systems - MCQIB BIOLOGY SL - C3.1 Integration of body systems - MCQ — Qu…IB Biology SL C3.1 Integration of body systems - Past paper…
  12. C3.2Defence against disease10 minStudy
  13. IB BIOLOGY SL - C3.2 Defence against disease - MCQIB Biology SL C3.2 Defence against disease - Past paper MCQ
  14. C4.1Populations and communities10 minStudy
  15. IB BIOLOGY SL - C4.1 Populations and communities - MCQIB Biology SL C4.1 Populations and communities - Past paper…
  16. C4.2Transfers of energy and matter10 minStudy
  17. IB BIOLOGY SL - C4.2 Transfers of energy and matter - MCQIB Biology SL C4.2 Transfers of energy and matter - Past pa…
4

Theme D — Continuity and change

14 lessons
  1. 4.1Theme D — Continuity and change12 minStudy
  2. D1.1DNA replication10 minStudy
  3. IB BIOLOGY SL - D1.1 DNA replication - MCQIB Biology SL D1.1 DNA replication - Past paper MCQ
  4. D1.2Protein synthesis10 minStudy
  5. IB BIOLOGY SL - D1.2 Protein synthesis - MCQIB Biology SL D1.2 Protein synthesis - Past paper MCQ
  6. D1.3Mutation and gene editing10 minStudy
  7. IB BIOLOGY SL - D1.3 Mutation and gene editing - MCQIB Biology SL D1.3 Mutation and gene editing - Past paper M…
  8. D2.1Cell and nuclear division10 minStudy
  9. IB BIOLOGY SL - D2.1 Cell and nuclear division - MCQIB Biology SL D2.1 Cell and nuclear division - Past paper M…
  10. D2.3Water potential10 minStudy
  11. IB BIOLOGY SL - D2.3 Water potential - MCQIB Biology SL D2.3 Water potential - Past paper MCQ
  12. D3.1Reproduction10 minStudy
  13. IB BIOLOGY SL - D3.1 Reproduction - MCQIB Biology SL D3.1 Reproduction - Past paper MCQ
  14. D3.2Inheritance10 minStudy
  15. IB BIOLOGY SL - D3.2 Inheritance - MCQIB Biology SL D3.2 Inheritance - Past paper MCQ
  16. D3.3Homeostasis10 minStudy
  17. IB BIOLOGY SL - 14.6 Homeostasis — Past papersIB BIOLOGY SL - D3.3 Homeostasis - MCQIB Biology SL D3.3 Homeostasis - Past paper MCQ
  18. D4.1Natural selection10 minStudy
  19. IB BIOLOGY SL - D4.1 Natural selection - MCQIB Biology SL D4.1 Natural selection - Past paper MCQ
  20. D4.2Stability and change10 minStudy
  21. IB Biology SL D4.2 Stability and change - Past paper MCQ
  22. D4.3Climate change10 minStudy
  23. IB BIOLOGY SL - D4.3 Climate change - MCQIB Biology SL D4.3 Climate change - Past paper MCQ
  24. 4.13Causes of Climate Change12 minStudy
  25. 4.14Impact of Climate Change12 minStudy
  26. Unit practiceIB BIOLOGY SL - 18.2 Mutation — Past papers
5

Tools

10 lessons
  1. 5.15. Tools12 minStudy
  2. 5.2Safety, Ethical and Environmental Issues in Biology12 minStudy
  3. 5.3Measuring Variables in Biology12 minStudy
  4. 5.4Applying Techniques in Biology12 minStudy
  5. 5.5Applying Technology to Collect Data in Biology12 minStudy
  6. 5.6Applying Technology to Process Data in Biology12 minStudy
  7. 5.7Applying General Mathematics in Biology12 minStudy
  8. 5.8Using Units, Symbols and Numerical Values in Biology12 minStudy
  9. 5.9Processing Uncertainties in Biology12 minStudy
  10. 5.10Graphing in Biology12 minStudy
6

Inquiry Process

10 lessons
  1. 6.16. Inquiry Process12 minStudy
  2. 6.2The Process of Photosynthesis12 minStudy
  3. 6.3Exploring in Biology12 minStudy
  4. 6.4Designing in Biology12 minStudy
  5. 6.5Controlling Variables in Biology12 minStudy
  6. 6.6Collecting Data in Biology12 minStudy
  7. 6.7Processing Data in Biology12 minStudy
  8. 6.8Interpreting Results in Biology12 minStudy
  9. 6.9Concluding in Biology12 minStudy
  10. 6.10Evaluating in Biology12 minStudy
7

Additional lessons

142 lessons
  1. 7.1Cell Theory- Skills12 minStudy
  2. 7.2Microscopes12 minStudy
  3. 7.3Cell Types and Structures- Skills12 minStudy
  4. 7.4Drawing Cells- Skills12 minStudy
  5. 7.5Evidence of Evolution12 minStudy
  6. 7.6Convergent Evolution12 minStudy
  7. 7.7Reasons for Extinction12 minStudy
  8. 7.8Ecosystem Loss12 minStudy
  9. 7.9Loss of Biodiversity12 minStudy
  10. 7.10How to Preserve Biodiversity12 minStudy
  11. 7.11Properties of Carbon12 minStudy
  12. 7.12Macromolecules12 minStudy
  13. 7.13Carbohydrates: Definition, Functions and Examples12 minStudy
  14. 7.14Role of Glycoproteins12 minStudy
  15. 7.15Fatty Acids12 minStudy
  16. 7.16Phospholipids12 minStudy
  17. 7.17Formation of Proteins12 minStudy
  18. 7.18The Variety of Proteins12 minStudy
  19. 7.19Protein Structure: Effect of pH and Temperature12 minStudy
  20. 7.20Lipid Bilayers12 minStudy
  21. 7.21Membrane Proteins12 minStudy
  22. 7.22Glycolipids and Glycoproteins12 minStudy
  23. 7.23The Fluid Mosaic Model: Skills12 minStudy
  24. 7.24Cell Organelles12 minStudy
  25. 7.25Cell Compartmentalisation12 minStudy
  26. 7.26Stem Cells12 minStudy
  27. 7.27Gas Exchange in Organisms12 minStudy
  28. 7.28Mammalian Lungs: Adaptations12 minStudy
  29. 7.29Mechanism of Ventilation12 minStudy
  30. 7.30Measuring Lung Volumes: Skills12 minStudy
  31. 7.31Gas Exchange in Plants12 minStudy
  32. 7.32Drawing Leaf Structure: Skills12 minStudy
  33. 7.33Determining Stomatal Density: Skills12 minStudy
  34. 7.34Blood Vessels12 minStudy
  35. 7.35Identifying Blood Vessels12 minStudy
  36. 7.36Measuring Pulse Rate12 minStudy
  37. 7.37Coronary Heart Disease12 minStudy
  38. 7.38The Transpiration Stream12 minStudy
  39. 7.39Adaptations of Xylem Vessels12 minStudy
  40. 7.40Drawing Root and Stem Structure12 minStudy
  41. 7.41Habitats12 minStudy
  42. 7.42Abiotic Factors and Species Distribution12 minStudy
  43. 7.43Species Distribution Skills12 minStudy
  44. 7.44Abiotic Factors in Marine and Terrestrial Habitats12 minStudy
  45. 7.45Biomes12 minStudy
  46. 7.46Methods of Nutrition12 minStudy
  47. 7.47Nutrition in Hominidae12 minStudy
  48. 7.48Nutrition: Adaptations of Organisms12 minStudy
  49. 7.49Competition Between Species12 minStudy
  50. 7.50Metabolism: Enzymes and Reactions12 minStudy
  51. 7.51Enzyme Action12 minStudy
  52. 7.52Enzyme Activity Skills12 minStudy
  53. 7.53Enzyme Reaction Rates Skills12 minStudy
  54. 7.54Activation Energy Skills12 minStudy
  55. 7.55Adenosine Triphosphate (ATP)12 minStudy
  56. 7.56Cell Respiration Skills12 minStudy
  57. 7.57Separating Photosynthetic Pigments12 minStudy
  58. 7.58Absorption Spectra12 minStudy
  59. 7.59Absorption and Action Spectra Skills12 minStudy
  60. 7.60Limiting Factors of Photosynthesis12 minStudy
  61. 7.61Carbon Dioxide Enrichment Experiments12 minStudy
  62. 7.62Nerve Impulses12 minStudy
  63. 7.63Nerve Impulses: Skills12 minStudy
  64. 7.64Synapses12 minStudy
  65. 7.65Integration in Living Organisms12 minStudy
  66. 7.66The Nervous System12 minStudy
  67. 7.67Reflex Arc and Movement Control12 minStudy
  68. 7.68Epinephrine and Melatonin12 minStudy
  69. 7.69Control Mechanisms12 minStudy
  70. 7.70Pathogens12 minStudy
  71. 7.71Barriers to Pathogens: Skin and Mucous Membranes12 minStudy
  72. 7.72Blood Clotting12 minStudy
  73. 7.73The Immune System12 minStudy
  74. 7.74White Blood Cells12 minStudy
  75. 7.75Adaptive Immune Response12 minStudy
  76. 7.76HIV and AIDS12 minStudy
  77. 7.77Antibiotics12 minStudy
  78. 7.78Antibiotic Resistance12 minStudy
  79. 7.79Zoonoses12 minStudy
  80. 7.80Vaccines and Immunity12 minStudy
  81. 7.81Evaluating COVID-19 Data: Skills12 minStudy
  82. 7.82Populations in Ecosystems12 minStudy
  83. 7.83Estimating Population Size12 minStudy
  84. 7.84Limiting Population Size12 minStudy
  85. 7.85Limiting Population Size: Examples12 minStudy
  86. 7.86Population Growth Curves: Skills12 minStudy
  87. 7.87Populations: Intraspecific Relationships12 minStudy
  88. 7.88Community: Interspecific Relationships12 minStudy
  89. 7.89Interspecific Competition12 minStudy
  90. 7.90Chi-Squared Test: Skills12 minStudy
  91. 7.91Ecosystems as Open Systems12 minStudy
  92. 7.92Energy Flow in Ecosystems12 minStudy
  93. 7.93Obtaining Carbon Compounds in Ecosystems12 minStudy
  94. 7.94Trophic Levels12 minStudy
  95. 7.95Pyramids of Energy: Skills12 minStudy
  96. 7.96Energy Losses12 minStudy
  97. 7.97Primary and Secondary Production12 minStudy
  98. 7.98The Carbon Cycle12 minStudy
  99. 7.99Nutrient Cycling12 minStudy
  100. 7.100Electrophoresis and PCR12 minStudy
  101. 7.101Electrophoresis and PCR: Applications12 minStudy
  102. 7.102Transcription in Protein Synthesis12 minStudy
  103. 7.103Translation in Protein Synthesis12 minStudy
  104. 7.104The Genetic Code12 minStudy
  105. 7.105Protein Structure and Mutations12 minStudy
  106. 7.106Gene Mutations12 minStudy
  107. 7.107Consequences of Gene Mutations12 minStudy
  108. 7.108Mutations and Genetic Variation12 minStudy
  109. 7.109Cell Division12 minStudy
  110. 7.110Mitosis12 minStudy
  111. 7.111Mitosis: Skills12 minStudy
  112. 7.112Meiosis12 minStudy
  113. 7.113Osmosis12 minStudy
  114. 7.114Osmosis in Cells12 minStudy
  115. 7.115Osmosis: Skills12 minStudy
  116. 7.116Sexual and Asexual Reproduction12 minStudy
  117. 7.117Sexual Reproduction12 minStudy
  118. 7.118The Menstrual Cycle12 minStudy
  119. 7.119Fertilisation12 minStudy
  120. 7.120Plant Reproduction12 minStudy
  121. 7.121Pollination12 minStudy
  122. 7.122Seed Dispersal and Germination12 minStudy
  123. 7.123Genetic Inheritance and Genetic Crossing12 minStudy
  124. 7.124Inheritance: Terminology12 minStudy
  125. 7.125Inheriting Alleles12 minStudy
  126. 7.126Sex Determination12 minStudy
  127. 7.127Pedigree Charts12 minStudy
  128. 7.128Continuous Variation: Skills12 minStudy
  129. 7.129Homeostasis: Maintaining the Internal Environment12 minStudy
  130. 7.130Regulation of Blood Glucose12 minStudy
  131. 7.131Thermoregulation12 minStudy
  132. 7.132Natural Selection and Evolution12 minStudy
  133. 7.133Selection Pressures12 minStudy
  134. 7.134Selection Pressures: Skills12 minStudy
  135. 7.135Stability in Ecosystems12 minStudy
  136. 7.136Ecosystem Stability: Skills12 minStudy
  137. 7.137Keystone Species12 minStudy
  138. 7.138Sustainability in Ecosystems and Agriculture12 minStudy
  139. 7.139Eutrophication12 minStudy
  140. 7.140The Effects of Pollution12 minStudy
  141. 7.141Restoring Ecosystems12 minStudy
  142. 7.142Carbon Sequestration12 minStudy