IB ESS HL 2.4.5 Tricellular Model Question Bank
Use the tricellular model to explain global circulation and climate zones.
- Syllabus
- First assessment 2026
- Course
- ESS HL
- Level
- HL
Exam points
- identify the climate or biome pattern in the evidence
- apply circulation, heat or precipitation relationships
- justify impacts using climate-system processes
2.4.5—Tricellular model question 1
[Maximum number: 3]
Atmospheric and plate activity have affected the distribution and diversity of systems within the biosphere.
Explain the role that the atmosphere has in the distribution of biomes.
Role of atmosphere: atmosphere contributes to patterns of climate/heat/temperature/ precipitation; rising hot, damp air at equator condenses as it meets colder air; ...causing high rainfall and ideal conditions for rainforests in that region; descending dry air at slightly higher latitudes/30 degrees N/S; ...gives rise to desert systems; atmospheric circulation transfers heat from equator to higher latitudes; ...allowing for life-supporting temperatures in temperate grasslands/ forests/tundra biomes;
Note to examiners: Credit must be given for answers that address biomes not species.
Full credit can be given for a well drawn annotated tri-cellular model with biomes and atmospheric flows shown.
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