Description
Master Topic 2 of the updated IB Environmental Systems and Societies (ESS) course with this comprehensive student workbook, fully aligned to the syllabus for first examinations in 2026.
This workbook helps students build a strong understanding of ecology, from the organization of life in the biosphere to the global patterns that shape ecosystems across the planet. Through guided notes, structured practice activities, exam-style questions, and a complete answer key, students develop the knowledge and skills needed to succeed in IB ESS. Designed for both Standard Level (SL) and Higher Level (HL) students, it provides a clear pathway through the most important concepts, terminology, and assessment objectives in Topic 2.
Whether used in the classroom, for homework, revision, independent study, or exam preparation, this workbook encourages active learning and helps students develop the analytical and evaluation skills required for success in IB ESS.
What You’ll Learn
Topic 2.1: Ecosystems and Ecology
Students explore:
- The organization of life from individuals and populations to communities and ecosystems
- The biological species concept and why it can be challenging to apply
- Classification of organisms and the tools taxonomists use, including DNA barcoding
- Abiotic and biotic factors and how they determine species distribution
- The concept of ecological niche, including fundamental and realized niches
- Types of population interactions, including predation, parasitism, mutualism, and competition
- Keystone species and their role in maintaining ecosystem structure
- Population sampling techniques, including the mark-recapture method and the Lincoln index
- Planetary boundaries and the concept of ecological tipping points
- r- and K-selected species and life history strategies (HL)
Topic 2.2: Energy and Biomass in Ecosystems
Students investigate:
- How ecosystems are sustained by inputs of energy and matter
- Photosynthesis and cellular respiration as the foundation of energy flow
- Producers, consumers, detritivores, saprotrophs, and decomposers
- Food chains, food webs, and trophic levels
- Gross productivity and net productivity
- Ecological pyramids: numbers, biomass, and energy
- Bioaccumulation and biomagnification of persistent pollutants
- The environmental impacts of microplastics across trophic levels
Topic 2.3: Biogeochemical Cycles
Students examine:
- How carbon, nitrogen, and other elements cycle through biotic and abiotic stores
- The distinction between stores, sinks, and sources in biogeochemical cycles
- Carbon sequestration and the role of ecosystems as carbon sinks or sources
- •The impacts of fossil fuel combustion on the carbon cycle
- Ocean acidification as a consequence of rising atmospheric carbon dioxide
- The nitrogen cycle, including nitrogen fixation, nitrification, and denitrification
- Eutrophication and the environmental consequences of nitrogen and phosphorus pollution
- Human disruption of natural cycling rates and international efforts to manage nutrient use
Topic 2.4: Climate and Biomes
Students investigate:
- The difference between climate and weather
- How temperature, precipitation, and insolation determine biome distribution
- Major terrestrial and aquatic biomes and their limiting factors
- The tricellular model of atmospheric circulation, including Hadley, Ferrel, and polar cells
- Ocean currents and their influence on regional climates
- El Niño and La Niña events and their global ecological consequences
- The relationship between sea surface temperature and tropical cyclone intensity
- How climate change is shifting biome boundaries and disrupting phenological patterns
Topic 2.5: Zonation, Succession, and Change in Ecosystems
Students examine:
- Zonation and how environmental gradients drive community change across space
- Primary and secondary succession and the progression of seral communities
- The role of pioneer species in initiating succession
- Climax communities and the debate over the Vera wood-pasture hypothesis
- Ecosystem resilience and the concept of alternative stable states
- How human activity can divert succession and create plagioclimax communities
- Productivity patterns and how they change across successional stages (HL)
What’s Included
✔ Coverage of all Topic 2 syllabus statements for SL and HL
✔ Content aligned to the updated IB ESS syllabus (first examinations 2026)
✔ Separate sections for SL and HL content
✔ Key vocabulary tables with space for definitions and named examples
✔ Guided notes that mirror IB assessment language and command terms
✔ Structured practice activities including data analysis and diagram completion
✔ Exam-style short-answer and extended-response questions
✔ Critical-thinking opportunities aligned with Assessment Objectives AO2 and AO3
✔ Complete answer key included
Why Students Love This Workbook
Unlike traditional revision notes, this workbook actively engages students in the learning process. The guided activities are designed around the language and command terms used in IB assessments, helping learners build confidence while developing the skills required to analyze, explain, compare, evaluate, and justify environmental concepts.
Students can use the workbook throughout the course or as a focused revision tool before assessments.
Ideal For
- IB Environmental Systems and Societies students
- Standard Level (SL) students
- Higher Level (HL) students
- IB teachers seeking ready-to-use classroom resources
- Homeschool learners following the IB curriculum
- Students preparing for quizzes, tests, and final examinations
Product Details
Format: Digital PDF Download
Course: IB Environmental Systems and Societies (ESS)
Topic: Topic 2 – Ecology
Level: SL and HL
Answer Key: Included
Author: Bradley M Kremer
Publisher: IB ESSentials
Syllabus Alignment: First Examinations 2026
Important Information
This resource is independently produced and is not endorsed by or affiliated with the International Baccalaureate Organization (IBO).
Your purchase includes a license for individual educational use unless otherwise specified.
Explore additional IB ESS workbooks, revision resources, study guides, and teaching materials at mrkremerscience.com and ibessentials.org.
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