IB Diploma Biology SL, topic C4
Ecosystems (Interaction and interdependence)
This group looks at how organisms in an ecosystem depend on each other. C4.1 covers how populations are measured, how they grow and what limits them, and the relationships between species in a community. C4.2 follows energy as it flows through food chains and is lost as heat, and carbon and other elements as they are recycled.
Revision notes
Worksheet
FlashcardsSubtopics
Work through them in order. Each one has notes, exam questions and flashcards, and a PDF of each.
- 1Populations and communities Spec C4.1IB Biology C4.1: population sampling, Lincoln index, carrying capacity, growth curves, mutualism, competition, chi-squared and predator–prey control.NotesQuestions 8Flashcards 30
- 2Transfers of energy and matter Spec C4.2IB Biology C4.2: energy flow, autotrophs and heterotrophs, trophic levels, energy pyramids, production, the carbon cycle, the Keeling Curve and recycling.NotesQuestions 8Flashcards 25
Whole topic
When you have done the subtopics: test yourself on everything, or print the lot.