IB ESS HL 2.5.13 Plagioclimax Question Bank
Explain how human management can maintain a plagioclimax community.
- Syllabus
- First assessment 2026
- Course
- ESS HL
- Level
- HL
Exam points
- identify the HL succession mechanism or community concept
- trace the relevant species, productivity or management change
- evaluate assumptions and ecological evidence
2.5.13 (HL)—Plagioclimax question 1
[Maximum number: 2]
A group of researchers want to investigate succession in an ecosystem.
Describe how two human factors could affect succession.
clearance of land for agriculture; holding it in an early stage of succession / plagiosere; grazing of land by livestock; trampling from tourism;
human activities (eg tourism) leading to fires;
pollution from named human activities (eg mining);
introduction of plant/weed species/change to vegetation from near agricultural land;
Note: Do not award mark for statements such as "fire", "agriculture" without appropriate reason.
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