IB Biology HL · Unit 1 of 6

Unit 1: Unity and diversity

Unit 1 of IB Biology covers Unity and diversity. This unit contains 9 topics and 46 sub-topics. Below you'll find free study notes, flashcards, and exam preparation resources for every topic in this unit.

9 topics46 sub-topics

Exam technique guide

Topics in Unit 1

1.1

Water

5 sub-topics

1.2

Nucleic acids

4 sub-topics

1.3

Origins of cells

5 sub-topics

1.4

Cell structure

6 sub-topics

1.5

Viruses

5 sub-topics

1.6

Diversity of organisms

6 sub-topics

1.7

Classification and cladistics

4 sub-topics

1.8

Evolution and speciation

5 sub-topics

1.9

Conservation of biodiversity

6 sub-topics

Study tip: Work through the topics in order — each builds on concepts from the one before. Start with notes, then reinforce with flashcards and practice questions.

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All Biology HL units Unit 2