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C3.1.17 (HL)—Tropic responses in seedlings

Tropic responses in seedlings links named stimuli, coordinating structures and effectors so body systems or plant tissues produce an integrated biological response.

Syllabus
First assessment 2025
Objective
C3.1.17
Level
HL

Concept essentials

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