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Paper 1
Ecosystems Overview
Both
Name the stores and the transfers.
Key Facts
- Inputs and outputs keep ecosystems in balance.
- NPP is higher where temperature and rainfall are high.
- Human activity can disrupt cycles and reduce biodiversity.
- Ecosystem services provide benefits like clean water and food.
Key Equations
NPP = GPP - R
Topics Covered
Ecosystem Components
What you need to know
- •Biotic and abiotic factors interact in ecosystems.
Exam Tips
- Use examples like soil, water, and vegetation.
Nutrient Cycle
What you need to know
- •Stores include biomass, litter, soil, and rock.
Exam Tips
- Describe transfers like litter fall and decomposition.
Key Terms
Biotic
Living parts of an ecosystem.
Abiotic
Non-living parts such as climate and soil.
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Common Exam Questions
Explain why nutrient cycles are faster in tropical rainforests.
4 marksmediumPaper 1
Model Answer
High temperatures and rainfall speed up decomposition, returning nutrients quickly to biomass.
What examiners want to see
- ✓Link climate to decomposition and nutrient transfer.
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