Lesson 4.7.2.1

4.7.2.1 Levels of organisation Quiz: AQA Combined Science, Unit 7

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.7.2.1, Levels of organisation: 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 are photosynthetic organisms described as in an ecosystem?

    • producers of biomass
    • secondary consumers
    • primary consumers
    • apex predators

  2. All food chains begin with which organism?

    • a decomposer
    • a predator
    • a tertiary consumer
    • a producer

  3. What do green plants make during photosynthesis?

    • starch
    • cellulose
    • protein
    • glucose

  4. What do primary consumers feed on in a food chain?

    • decomposers
    • producers
    • apex predators
    • secondary consumers

  5. Consumers that kill and eat other animals are called what?

    • prey
    • predators
    • decomposers
    • producers

  6. Animals that are eaten by predators are called what?

    • consumers
    • predators
    • producers
    • prey

  7. What is a quadrat used to sample in ecology?

    • soil pH only
    • abundance and distribution
    • air temperature
    • wind speed

  8. Which term is the middle value in a data set?

    • median
    • mean
    • range
    • mode

  9. Ten quadrat counts are 4, 6, 6, 8, 2, 6, 4, 5, 7, 3. What is the mode?

    • 6
    • 8
    • 4
    • 5

  10. Using the same ten counts, what is the arithmetic mean?

    • 5.0
    • 5.5
    • 6.0
    • 5.1

  11. What is the median of the same ten counts?

    • 6.0
    • 4.5
    • 5.1
    • 5.5

  12. When do predator numbers typically rise on a predator-prey graph?

    • at the same time
    • during habitat loss
    • after prey rise
    • before prey rise

  13. In grass, grasshopper, frog, snake, which organism is a tertiary consumer?

    • the snake
    • the frog
    • the grass
    • the grasshopper

  14. In grass, rabbit, fox, which organism is a secondary consumer?

    • the fox
    • a decomposer
    • the grass
    • the rabbit

  15. What is essential when selecting scales for graph axes?

    • using small numbers
    • making scales equal
    • spreading the data
    • starting at zero

  16. What sampling method gives an unbiased population estimate using quadrats?

    • dense clustering
    • edge placing
    • random placement
    • even spacing

  17. What causes plant distribution to change along a transect line?

    • animal migration
    • random genetic drift
    • environmental factors
    • barometric pressure

  18. Why do food chains usually contain very few organisms at the top level?

    • larger body sizes
    • less energy available
    • faster movement speeds
    • higher birth rates

  19. How do predator and prey numbers change in a stable community?

    • increase continuously
    • decrease rapidly
    • remain completely constant
    • rise and fall

  20. Why is a larger sample size used in population studies?

    • takes less time
    • more reliable estimate
    • saves equipment costs
    • eliminates all errors

All AQA Combined Science quizzes