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A3.1 Diversity of organisms Lessons - IB Biology

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A3.1 Diversity of organisms

IB Biology Topic A3.1: Diversity of Organisms Lessons

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Lessons for A3.1 Diversity of organisms - IB

This lesson delivers structured, step-by-step lessons that guide students through every part of the IB Biology syllabus for A3.1 Diversity of organisms. These lessons simplify complex ideas like molecular biology, evolutionary mechanisms, and homeostasis, while worked examples show how to approach IB-style questions.

Designed for both HL and SL learners, RevisionDojo lessons ensure students not only understand the theory but also know how to apply it in IB Paper exam situations.

With clear explanations, active learning checks, and a syllabus-first design, RevisionDojo makes revision less overwhelming and more effective.

A3.1.1 Variation between organisms as a defining feature of life

A3.1.2 Species as groups of organisms with shared traits

A3.1.3 Binomial system for naming organisms

A3.1.4 Biological species concept

A3.1.5 Difficulties distinguishing between populations and species

A3.1.6 Diversity in chromosome numbers of plant and animal species

A3.1.7 Karyotyping and karyograms

A3.1.8 Unity and diversity of genomes within species

A3.1.9 Diversity of eukaryote genomes

A3.1.10 Comparison of genome sizes

A3.1.11 Current and potential future uses of whole genome sequencing

A3.1.12 Difficulties applying the biological species concept (HL)

A3.1.13 Chromosome number as a shared trait within a species (HL)

A3.1.14 Engagement with local plant or animal species to develop a dichotomous key (HL)

A3.1.15 Identification of species from environmental DNA in a habitat using barcodes (HL)

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 (HL)

A4.1 Evolution and speciation

A4.2 Conservation of biodiversity