Managing ecosystems and biodiversity

Worked examples (6)

• 1Describing a biome (climate, soil and vegetation)
• 2Distinguishing primary and secondary succession
• 3Calculating energy-transfer efficiency
• 4Interpreting an ecological pyramid and explaining its shape
• 5Explaining GPP, NPP and energy-transfer efficiency
• 6Why some pyramids invert but the pyramid of energy never does

Model answers (6)

• ✓Model answer 1
• ✓Model answer 2
• ✓Model answer — 8291 Paper 1/2 style (calculation + explanation, AO2)
• ✓Model answer 4
• ✓Model answer — 8291 Paper 1 style (extended explanation, AO1/AO2)
• ✓Model answer — 8291 Paper 1 Section B style (essay, AO2/AO3)

Worked examples (6)

• 1Defining native and invasive species
• 2Explaining the impacts of invasive species
• 3Describing the benefits of conserving biodiversity
• 4Describing and evaluating captive breeding and release
• 5Describing and evaluating habitat conservation and rewilding
• 6Explaining CITES, the IUCN Red List and EDGE, and planning a 20-mark essay

Model answers (6)

• ✓Model answer 1
• ✓Model answer 2
• ✓Model answer — 8291 Paper 1/2 style (explanation, AO1/AO2)
• ✓Model answer 4
• ✓Model answer — 8291 Paper 1 style (extended evaluation, AO1/AO2/AO3)
• ✓Model answer — 8291 Paper 1 Section B style (essay, AO2/AO3)

Worked examples (6)

• 1Describing human impacts on a tropical rainforest
• 2Stating human impacts on Antarctica
• 3Explaining how deforestation causes fragmentation and biodiversity loss
• 4Evaluating debt-for-nature swaps as a rainforest strategy
• 5Evaluating the Antarctic Treaty and tourism controls
• 6Comparing the two ecosystems and planning a 20-mark essay

Model answers (6)

• ✓Model answer 1
• ✓Model answer 2
• ✓Model answer — 8291 Paper 1/2 style (explain impacts, AO1/AO2)
• ✓Model answer 4
• ✓Model answer — 8291 Paper 1 style (extended evaluation, AO3)
• ✓Model answer — 8291 Paper 1 Section B style (essay, AO2/AO3)