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C3.1.2—Hierarchy in multicellular organisms

Hierarchy in multicellular organisms links named stimuli, coordinating structures and effectors so body systems or plant tissues produce an integrated biological response.

Syllabus
First assessment 2025
Objective
C3.1.2
Level
HL

Concept essentials

  • Hierarchy in multicellular organisms depends on linking the stimulus to the coordinating structure or signal.
  • The pathway for hierarchy in multicellular organisms must keep information flow and response direction clear.
  • Named tissues, hormones, neurons or effectors give hierarchy in multicellular organisms its biological specificity.
  • Evidence about hierarchy in multicellular organisms is strongest when structure, mechanism and outcome are connected.
ConceptIB Biology HL