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NotesESS HLTopic 2.8
Unit 2 · Ecology · Topic 2.8

IB ESS HL — Biomes, zonation, succession

HL Topic 2.8 requires more sophisticated analysis of biome distribution, including the use of climate diagrams and quantitative data to explain zonation patterns. Students evaluate succession models with greater depth and apply them to restoration ecology scenarios.

2.8 FlashcardsExam technique guidePractice questions

Key concepts in Biomes, zonation, succession

Key Idea: Topic 2.8 explains how **climate shapes biomes**, how energy is redistributed by the **atmosphere and oceans**, and how ecosystems change across **space (zonation)** and **time (succession)**. It also introduces **resilience** — why some ecosystems recover after disturbance and others collapse.

🌍 Biomes & climate (must-know)

Biomes are shaped by **climate**, not day-to-day weather.

🌬️ Atmosphere: why rainfall patterns exist (SL)


🌊 Aquatic biomes & ocean currents

Link currents to climate: they **moderate coastal temperatures** and influence rainfall patterns.

📍 Zonation (change across space)


⏳ Succession (change over time)

Easy compare: **Zonation = space**, **Succession = time**.

🛡️ Resilience (why ecosystems recover)


1) Weather vs climate? 2) What controls biome distribution? 3) What is zonation? 4) Primary vs secondary succession? 5) Two features that increase resilience?

What you'll learn in Topic 2.8

  • 2.8.1 Biomes
  • 2.8.2 Zonation
  • 2.8.3 Succession

Exam relevance

At Higher Level, ESS includes an extended essay component and deeper analytical questioning. Expect longer data-response questions and more complex case study scenarios in both Paper 1 and Paper 2.

Suggested study order: Read the notes for each sub-topic below → test yourself with flashcards → attempt practice questions → review exam technique.

Study resources — 2.8 Biomes, zonation, succession

2.8.1

Biomes

NotesFlashcards
2.8.2

Zonation

NotesFlashcards
2.8.3

Succession

NotesFlashcards

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Topic 2.8 Biomes, zonation, succession forms a core part of Unit 2: Ecology in IB ESS HL. Mastering these concepts will strengthen your understanding of connected topics across the syllabus and prepare you for exam questions that require analysis, evaluation, and real-world application.

Frequently asked questions

What does Topic 2.8 Biomes, zonation, succession cover in IB ESS?
Topic 2.8 covers biomes, zonation, succession as part of the IB ESS syllabus. Students learn key concepts, definitions, and real-world examples that are tested in Paper 1 and Paper 2 exams.
How should I revise Biomes, zonation, succession for IB ESS exams?
Start by reading the micro-topic notes to understand each concept, then use flashcards to memorise key terms. Practise exam-style questions to apply your knowledge under timed conditions and review the marking criteria.
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