Lesson 4.7.3.1

4.7.3.1 Biodiversity Quiz: AQA Combined Science, Unit 7

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.7.3.1, Biodiversity: 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 7: Ecology, written with Revision Ninja.

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The 20 questions

  1. What term describes the variety of all different species on Earth?

    • biosphere
    • biodiversity
    • biomass
    • biotype

  2. How does high biodiversity help maintain ecosystem stability?

    • reduces species dependence
    • removes all competition
    • stops all predation
    • increases carbon emissions

  3. What does the future survival of the human species rely upon?

    • maintaining biodiversity
    • increasing deforestation
    • reducing global temperature
    • eliminating microorganisms

  4. What are many human activities doing to biodiversity?

    • leaving it unchanged
    • creating new species
    • increasing it
    • reducing it

  5. When were measures first introduced to try to stop reducing biodiversity?

    • only recently
    • during the industrial revolution
    • in ancient times
    • centuries ago

  6. What term defines the variety of all different species on Earth?

    • Biosphere
    • Biomass
    • Biodiversity
    • Biome

  7. What do members of the same species share that allows them to breed?

    • Identical DNA
    • Fertile offspring
    • Asexual clones
    • Same habitat

  8. What property of ecosystems is directly increased by high biodiversity?

    • Population size
    • Energy transfer
    • Stability
    • Biomass

  9. What happens to biodiversity when many insect species are killed by pollutants?

    • It increases
    • It doubles
    • It decreases
    • It stays constant

  10. Which factor directly determines which of two lakes has greater biodiversity?

    • Water volume
    • Nutrient concentration
    • Number of species
    • Total animal mass

  11. A falling number of species over time indicates what ecological trend?

    • Biomass growth
    • Declining biodiversity
    • Ecological succession
    • Population surplus

  12. What ecological term describes bees pollinating flowers?

    • Predation
    • Parasitism
    • Interdependence
    • Competition

  13. What effect does replacing a natural meadow with a crop monoculture have on biodiversity?

    • No effect
    • Increases it
    • Decreases it
    • Doubles it

  14. For what three key requirements do species depend on one another?

    • Carbon, soil, mates
    • Water, light, minerals
    • Food, shelter, pollination
    • Oxygen, heat, space

  15. Why does low biodiversity reduce the overall stability of an ecosystem?

    • High interdependence vulnerability
    • Rapid nutrient recycling
    • Excessive biomass
    • Too many predators

  16. What does the future of the human species on Earth rely on maintaining?

    • Global monoculture
    • Industrial output
    • Good biodiversity
    • Fossil fuels

  17. Which two human activities severely reduce global biodiversity?

    • recycling and conservation
    • breeding and planting
    • deforestation and pollution
    • irrigation and weeding

  18. Why does a single-crop agricultural field show much lower biodiversity than a forest?

    • Fewer species coexist
    • Excessive shade
    • Higher soil nutrients
    • Too much water

  19. What environmental condition do the species that humans depend on require?

    • Healthy environment
    • Artificial heating
    • Urbanized land
    • Chemical fertilisers

  20. High biodiversity helps maintain the physical environment, including what factors?

    • Tides and gravity
    • Orbits and seasons
    • Rocks and magma
    • Soil and climate

All AQA Combined Science quizzes