IB Biology HL C Interaction and Interdependence Questions

Practise IB Biology HL C Interaction and Interdependence through questions on signalling, transport, defence, ecosystems and organism interactions, including the wider HL evidence set.

1,213 questions in this syllabus scope, with question parts counted together.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam analysis

HL · 2010–2025
Past-paper evidence in Interaction and Interdependence clusters around regulated processes, signalling, defence and ecological relationships. The recurring pattern is explaining how interactions control biological outcomes, from enzyme activity and energy transfer to population change and ecosystem cycling.
Papers with this topic115 / 117in the analysed sample
Latest appearanceNovember 2025
Tagged question parts818
Paper types5

Most tested topics

  1. C1.1 Enzymes and metabolism67 papers
  2. C4.2 Transfers of energy and matter67 papers
  3. C3.1 Integration of body systems63 papers
  4. C2.2 Neural signalling62 papers
  5. C3.2 Defence against disease61 papers

117 papers analysed · Tagging incomplete