IB Biology Resources

IB Biology Questions, Videos, Notes & Flashcards (SL & HL)

Standard Level (SL) & Higher Level (HL)

This page contains links to all of our biology resources, including our IB biology revision notes, videos, flashcard decks, and exam questions. Our resources cover both IB biology SL and IB biology HL. Our revision material is all divided by the international baccalaureate sub-topics, covering topics 1 to 11.

We recommend starting by watching our animated videos, before revising your biology knowledge with our IB bio topic notes and flashcard decks. After you know the syllabus well, try our IB biology questions, making sure to check the mark schemes!

Topic 1: Cells

This topic of IB biology explores the cells found within all living organisms. It builds the fundamental understanding required for later topics in the IB biology syllabus. Included are the biology IB sub-themes of: cells, cell theory, specialisation, prokaryotes, eukaryotes, membranes, particle transport, cell division, and cancer.

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Exam Questions

1.1: Introduction to cells

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1.2: Ultrastructure of cells

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1.3: Membrane structure

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1.4: Membrane transport

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1.5: Origin of cells

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1.6: Cell division

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Topic 2: Molecules

This topic of IB biology explores the molecules and components found within cells. It links to the content covered in topic 1 of the IB biology syllabus. Included are the biology IB sub-themes of: molecules, metabolism, water, carbohydrates, proteins, lipids, enzymes, nucleic acids (DNA & RNA), replication, transcription, translation, respiration, and photosynthesis.

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2.1: Molecules to metabolism

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2.2: Water

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2.3: Carbohydrates & lipids

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2.4: Proteins

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2.5: Enzymes

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2.6: Structure of DNA & RNA

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2.7: Replication, transcription & translation

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2.8: Respiration

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2.9: Photosynthesis

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Topic 3: Genetics

This topic of IB biology explores the genetic information present within all living organisms. It provides understanding necessary for the later topics in the IB biology syllabus. Included are the biology IB sub-themes of: genes, chromosomes, nuclei, karyotyping, karyograms, genetic variation, Mendel, alleles, ABO blood groups, genetic diseases, electrophoresis, PCR, and cloning.

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3.1: Genes

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3.2: Chromosomes

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3.3: Meiosis

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3.4: Inheritance

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3.5: Genetic modification & biotechnology

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Topic 4: Ecology

This topic of IB biology explores the organisms and their interaction with the natural environment that surrounds them. It covers terms used elsewhere in the IB biology course. Included are the biology IB sub-themes of: species, communities, ecosystems, food chains, food webs, energy, energy loss, methanogenesis, carbon dioxide, nitrogen, greenhouse gasses, and global warming.

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Exam Questions

4.1: Species, communities, & ecosystems

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4.2: Energy flow

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4.3: Carbon cycling

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4.4: Climate change

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Topic 5: Evolution & Biodiversity

This topic of IB biology discusses the existence and emergence of life on planet earth. The content covered is unique to this topic of IB biology. Included are the biology IB sub-themes of: evidence for evolution, variation, speciation, natural selection, adaptation, the binomial system, classification, taxonomy, and cladistics.

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Exam Questions

5.1: Evidence for evolution

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5.2: Natural selection

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5.3: Classification of biodiversity

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5.4: Cladistics

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Topic 6: Human Physiology

This topic of IB biology explores the physiological processes occurring within humans. The content covered builds on the fundamentals established by earlier topics of the IB biology syllabus. Included are the biology IB sub-themes of: digestion, organs, blood vessels, the heart, the fight or flight response, immunity, antibiotics, ventilation, gas exchange, neurones, synapses, hormones, and the menstrual cycle.

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Exam Questions

6.1: Digestion & absorption

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6.2: Circulation & blood

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6.3: Defence against infectious disease

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6.4: Gas exchange

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6.5: Neurones & synapses

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6.6: Hormones, homeostasis & reproduction

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Topic 7: Nucleic Acids

This topic of IB biology explores the processes of DNA handling in great depth. It builds on the material included earlier in topic 2 of the IB biology syllabus. Included are the biology IB sub-themes of: DNA, nucleosomes, DNA replication, DNA transcription, DNA translation, regulation and protein structure.

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Exam Questions

7.1: DNA structure & replication

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7.2: Transcription & gene expression

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7.3: Translation

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Topic 8: Metabolism, Respiration & Photosynthesis

This topic of IB biology covers the two major metabolic reactions that occur in living organisms. It builds on the material included earlier in topic 2 of the IB biology syllabus. Included are the biology IB sub-themes of: metabolism, enzymes, pathways, respiration, chemiosmosis, mitochondria, photosynthesis, photolysis, and chloroplasts.

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Exam Questions

8.1: Metabolism

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8.2: Respiration

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8.3: Photosynthesis

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Topic 9: Plants

This topic of IB biology covers the structures, functions and processes of plants on earth. The material within this topic is not covered elsewhere on the IB biology syllabus. Included are the biology IB sub-themes of: transpiration, properties of water, active uptake, the xylem, the phloem, meristems, auxins, geotropism, phototropism, and flowering.

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9.1: Transport in the Xylem

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9.2: Transport in the Phloem

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9.3: Growth in plants

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9.4: Reproduction in plants

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Topic 10: Genetics & Evolution

This topic of IB biology further details the processes associated with the genetic code during reproduction. It builds on the material included earlier in topic 3 of IB biology. Included are the biology IB sub-themes of: chromosomes, crossing over, random orientation, loci, polygenic characteristics, Chi-squared, gene pools, and speciation.

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10.1: Meiosis

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10.2: Inheritance

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10.3: Gene pools & speciation

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Topic 11: Animal Physiology

This topic of IB biology spans the physiological processes that occur in animals. It discusses linked but unique themes to earlier topics in the IB biology course. Included are the biology IB sub-themes of: B-cells, T-cells, vaccines, monoclonal antibodies, bones, muscles, sarcomeres, nephrons and the kidneys, ADH, spermatogenesis, oogenesis, hCG, birthing, and the placenta.

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11.1: Antibody production & vaccination

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11.2: Movement & muscle contraction

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11.3: The Kidneys & osmoregulation

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11.4: Sexual reproduction

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