IB Environmental systems and societies 2.1 Individuals, Populations, Communities and Ecosystems Lessons

This lesson delivers structured, step-by-step lessons that guide students through every part of the IB Environmental systems and societies (ESS) syllabus for 2.1 Individuals, populations, communities and ecosystems. These lessons simplify complex ideas like sustainability assessment, biodiversity, and climate change modeling, 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.

2.1A Organisms

2.1B Population

2.1C Ecological Niche and Population Interactions

2.1D Carrying capacity

2.1E Population size and growth

2.1F Population abundance estimation

2.1G Community

2.1H Habitat

2.1I Ecosystems

2.1J Keystone species

2.1K Planetary boundaries model and biosphere integrity

2.1L Classification methods (HL)

2.1M Niche (HL)

2.1N r- and K strategists (HL)

2.1O Knowledge of species' classification (HL)

Topic 1: Foundation 3 subtopics

Topic 2: Ecology5 subtopics

Topic 3: Conservation and biodiversity3 subtopics

Topic 4: Water4 subtopics

Topic 5: Land2 subtopics

Topic 6: Atmosphere and climate change4 subtopics

Topic 7: Natural resources3 subtopics

Topic 8: Human populations and urban systems3 subtopics