Changing Ecosystems

Worked examples (6)

• 1Locate the Antarctic ecosystem
• 2One feature of the Antarctic climate
• 3Describe the Antarctic climate and why it is so cold
• 4Antarctic marine food chain
• 5Explain the Antarctic's low biodiversity
• 6Adaptations of Antarctic animals to the cold

Model answers (6)

• ✓Model answer — 0460 Paper 1 — style
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Worked examples (6)

• 1Antarctic food chain (2 marks)
• 2One adaptation to the cold (2 marks)
• 3Antarctic Circumpolar Current (5 marks)
• 4Krill seasonal cycle (5 marks)
• 5Energy flow in the Antarctic ecosystem (5 marks)
• 6Why krill are a keystone species (5 marks)

Model answers (6)

• ✓Model answer — 0460 Paper 1 — style
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Worked examples (6)

• 1Naming threats to the Antarctic ecosystem
• 2Stating impacts of ecosystem destruction
• 3How climate change is affecting Antarctica
• 4Why krill fishing concerns conservationists
• 5Describing four threats to the Antarctic ecosystem
• 6Assessing human impacts on the Antarctic ecosystem

Model answers (6)

• ✓Model answer — 0460 Paper 1 — style
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• ✓Model answer 3
• ✓Model answer — 0460 Paper 1 — style
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• ✓Model answer — 0460 Paper 1 — extended response (style)

Worked examples (6)

• 1Name a protection strategy (2 marks)
• 2State what the Treaty does (2 marks)
• 3CCAMLR and krill fishing (5 marks)
• 4Managing Antarctic tourism (5 marks)
• 5Explain how the ecosystem is protected (6 marks)
• 6Assess effectiveness of protection (7 marks)

Model answers (6)

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Worked examples (6)

• 1Where rainforests are found
• 2Equatorial climate of rainforests
• 3Why it rains every afternoon
• 4Plant adaptations to rainforest conditions
• 5The four-layer forest structure
• 6The rainforest nutrient cycle

Model answers (6)

• ✓Model answer — 0460 Paper 1 — style
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• ✓Model answer — 0460 Paper 1 — style — extended response

Worked examples (6)

• 1Name causes of deforestation
• 2Name impacts of deforestation
• 3Explain why deforestation causes soil erosion
• 4Explain a driver — commercial agriculture (palm oil)
• 5Explain the impacts of deforestation (developed)
• 6Extended response — assess impacts (Amazon)

Model answers (6)

• ✓Model answer — 0460 Paper 1 — style
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Worked examples (6)

• 1Name sustainable strategies
• 2Define agroforestry
• 3Explain selective logging and replanting
• 4REDD+ and debt-for-nature swaps
• 5Assess ecotourism using a named example
• 6Extended response — evaluate sustainable management

Model answers (6)

• ✓Model answer — 0460 Paper 1 — style
• ✓Model answer — 0460 Paper 1 — style
• ✓Model answer — 0460 Paper 1 — style
• ✓Model answer — 0460 Paper 1 — style
• ✓Model answer — 0460 Paper 1 — style
• ✓Model answer — 0460 Paper 1 — style (extended response)