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🎯 Common Question Types:
- "What is meant by the term ecosystem?" (2 marks) — AO1 recall; needs biotic AND abiotic AND interactions in your answer
- "Explain the nutrient cycle in a named ecosystem" (4 marks) — must name all three stores and the flows between them
- "Explain how one change can affect the whole ecosystem" (6 marks) — use cascade reasoning; each change must cause the next
- "Using a named small-scale UK ecosystem, explain interdependence" (6 marks) — Epping Forest is ideal here
- "Describe the distribution of [biome]" (3–4 marks) — latitude band, climate, named countries or regions
📝 Key Command Words:
- Describe: What does it look like? Use compass directions, latitude, climate data — NO explanation needed
- Explain: Give reasons using "because" and "this means that" — link cause to effect every time
- Compare: Note similarities AND differences; use linking language ("whereas", "in contrast", "similarly")
- Assess/How far: Reach a clear judgement in your final paragraph; state which side of the argument is stronger and why
⚠️ Common Mistakes to Avoid:
- Writing "energy cycles" instead of "energy flows" — examiners will mark this down immediately
- Describing a food chain instead of a food web — chains show one linear pathway; webs show the whole interconnected system
- Saying "tropical soil is fertile" — it is not; the nutrients are in the biomass, not the soil
- Listing components without showing how they interact — a list of biotic and abiotic factors does not demonstrate understanding; you must show the relationships between them
- Failing to name your UK ecosystem — you must name a specific place (Epping Forest, Braunton Burrows, etc.) not just say "a woodland" or "a sand dune"
- Stopping your cascade at one effect — for a 6-mark question, the examiner wants to see 3–4 linked effects, each causing the next
Quick Check: Why is the soil in a tropical rainforest surprisingly infertile despite the enormous size of the forest?
Tropical rainforest soil is infertile because almost all nutrients are locked in the living biomass, not the soil. The hot, wet conditions cause extremely rapid decomposition — dead matter breaks down in weeks, and plant roots absorb nutrients almost immediately. The soil store is tiny because nutrients barely pause there before being taken up again. There is no build-up of organic matter in the soil (as happens in temperate forests). Heavy tropical rain also causes significant leaching — nutrients are washed downward through the soil profile, below root reach. When the forest is cleared, nutrients leave with the biomass and the remaining soil nutrients are rapidly leached. This is why cleared tropical land typically becomes infertile within 2–3 years.
Quick Check: Name three abiotic factors that determine which biome exists in a location.
Three abiotic factors that determine biome location: (1) Latitude — controls the angle of sunlight and therefore temperature; equatorial areas are hot year-round (tropical rainforest), polar areas are cold (tundra). (2) Precipitation — determined by atmospheric pressure belts; equatorial low pressure causes heavy rain (rainforest); subtropical high pressure at 25–30° N/S suppresses rain (hot desert). (3) Distance from sea (continentality) — coastal areas have moderate temperatures and higher rainfall; continental interiors have extreme temperatures and lower rainfall (boreal forest or grassland). Also accept: ocean currents; altitude.
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