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C3.1.21 (HL)—Auxin promotes cell growth

Auxin promotes cell growth links named stimuli, coordinating structures and effectors so body systems or plant tissues produce an integrated biological response.

Syllabus
First assessment 2025
Objective
C3.1.21
Level
HL

Exam analysis

Chance of appearing7%of analysed past papers
Latest appearanceNovember 2023
Most common paperPaper1
Typical marks1–2

Common command terms

  • Explain
  • Identify

Scoring notes

Common mistake
Saying light directly makes cells grow instead of tracing auxin redistribution and cell elongation.

Recent exam appearances

November 2023Paper2 ["HL"] · TZ25(c)[ 2 ]C3.1.21 (HL)—Auxin promotes cell growth
November 2021Paper1 ["HL"] · TZ033[ 1 ]C3.1.21 (HL)—Auxin promotes cell growth
May 2021Paper1 ["HL"] · TZ140[ 1 ]C3.1.21 (HL)—Auxin promotes cell growth
May 2021Paper1 ["HL"] · TZ234[ 1 ]C3.1.21 (HL)—Auxin promotes cell growth
November 2020Paper1 ["HL"] · TZ033[ 1 ]C3.1.21 (HL)—Auxin promotes cell growth
Practice this objective

Coverage 2015–2023 · Updated 16 Jul 2026

Concept essentials

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