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D3.1.10—Promoting cross-pollination

Cross-pollination is promoted by timing differences, separation of sex organs, pollinator movement, wind transfer and self-incompatibility mechanisms in flowering plants.

Syllabus
First assessment 2025
Objective
D3.1.10
Level
HL

Exam analysis

Chance of appearing1%of analysed past papers
Latest appearanceNovember 2025
Most common paperPaper1A
Typical marks1

Common command terms

  • Outline

Recent exam appearances

November 2025Paper1A ["HL"] · TZ329[ 1 ]D3.1.10—Promoting cross-pollination
Practice this objective

Coverage 2025–2025 · Updated 16 Jul 2026

Concept essentials

  • Different maturation times of anthers and stigmas can reduce self-pollination.
  • Separate male and female plants strongly promote cross-pollination.
  • Self-incompatibility prevents successful fertilization by self pollen.
ConceptIB Biology HL