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CognitoBiodiversity and human impact on ecosystems
Key facts & methods
What is biodiversity? — fill in the table
| Term | Detail |
|---|
| Biodiversity | |
| Deforestation | |
| Climate change | |
Human impacts on biodiversity — fill in the table
| Impact | Effect on biodiversity |
|---|
| Agriculture | |
| Eutrophication | |
| Deforestation | |
| Global warming | |
| Invasive species | |
Conservation methods — fill in the table
| Method | Detail |
|---|
| Breeding programmes | |
| Seed banks | |
| Habitat protection | |
| Reintroduction programmes | |
| Reducing deforestation | |
| International agreements | |
Why biodiversity matters — fill in the table
| Reason | Detail |
|---|
| Ecosystem services | |
| Food security | |
| Medical resources | |
| Ethical argument | |
Exam questions — 5 questions · 11 marks · AQA 8461 style
⚡ Show all reasoning — the AI marks against the AQA mark scheme. Partial credit for correct biology even if wording differs.
4 marksEutrophicationAQA 8461 P2 style
A farmer applies excess fertiliser to fields near a river. Explain how this leads to a decrease in the number of fish in the river. (4 marks)
Hint: Chain of events: fertiliser → algal bloom → blocks light → plants die → decomposers increase → O₂ used up → fish die.
+40 XP
1 markBiodiversity definitionAQA 8461 style
What is meant by biodiversity?
A The total number of animals in an ecosystem
B The variety of all living organisms in an area, including species diversity and genetic diversity
C The number of individuals in a single species population
D The total biomass of all organisms in an ecosystem
3 marksConservation argumentAQA 8461 style
Give THREE reasons why maintaining biodiversity is important to humans. (3 marks)
Hint: Three separate reasons. For each, explain the benefit TO HUMANS specifically.
+30 XP
1 markEutrophication causeAQA 8461 style
Which of the following directly causes eutrophication in rivers?
A Acid rain from industrial pollution
B Excess nitrates and phosphates from fertiliser run-off causing excessive plant/algal growth
C Thermal pollution from power stations warming the water
D Plastic waste blocking sunlight from reaching the water
1 markConservation methodAQA 8461 style
What is the purpose of a seed bank?
A To grow food crops in remote areas
B To store seeds from threatened plant species so they can be preserved and potentially used in the future
C To allow plants to reproduce asexually
D To cross-breed plants to create disease-resistant varieties
Quick recall flashcards
Module complete! 🎉
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