Lesson T3.1.1

T3.1.1 Food webs and interdependence Quiz: KS3 Biology, Unit 3

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson T3.1.1, Food webs and interdependence: 20 multiple choice questions for the KS3 Biology (National Curriculum), Unit 3: Interactions and interdependencies, written with Revision Ninja.

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The 20 questions

  1. In a food web diagram, what do the arrows show?

    • Carbon absorption rate
    • Predator size order
    • Energy flow direction
    • Age of organisms

  2. What term describes an organism that makes its own food?

    • Predator
    • Consumer
    • Producer
    • Decomposer

  3. Which organism is a primary consumer in a grassland habitat?

    • Hawk
    • Grass
    • Fox
    • Rabbit

  4. What is the primary role of decomposers in an ecosystem?

    • Absorbing sunlight
    • Recycling soil nutrients
    • Hunting live prey
    • Producing glucose

  5. In the food chain grass to rabbit to fox, which organism is a secondary consumer?

    • The decomposer bacteria
    • The fox
    • The rabbit
    • The grass

  6. What happens to the fox population if all rabbits in a food web die?

    • It stays constant
    • It increases
    • It decreases
    • It becomes extinct

  7. What happens to grass growth if a disease removes most grasshoppers?

    • It stays constant
    • It increases
    • It stops completely
    • It decreases

  8. Why do food webs usually contain fewer top predators than producers?

    • Disease resistance
    • Higher intelligence
    • Rapid breeding
    • Energy loss

  9. What term describes an animal that hunts other animals for food?

    • Predator
    • Prey
    • Producer
    • Decomposer

  10. Which of these is a herbivore?

    • A lion
    • A shark
    • A cow
    • A spider

  11. A stoat eats a vole that eats grass. Which organism is the producer?

    • The vole
    • The stoat
    • Grass
    • Decomposer bacteria

  12. Why are food webs better than food chains?

    • Only show plants
    • Single straight lines
    • No predators exist
    • Multiple feeding links

  13. Which group recycles nutrients back into the soil?

    • Primary consumers
    • Top predators
    • Herbivores
    • Decomposers

  14. What is the term for a consumer that eats primary consumers?

    • Secondary consumer
    • Top predator
    • Producer
    • Primary consumer

  15. Why do top predators need a large territory?

    • Plants need space
    • Prey is infinite
    • Energy decreases upwards
    • Energy increases upwards

  16. What components make up ecosystem food webs?

    • Only top predators
    • Water and air
    • Producers, consumers, decomposers
    • Rocks and minerals

  17. What happens to producers if herbivores are removed?

    • Producers vanish
    • No effect
    • Producers would increase
    • Producers would decrease

  18. Which organism is classed as a secondary consumer?

    • Rabbit eating grass
    • Frog eating insects
    • Hawk eating frog
    • Grass eating sun

  19. What is a direct consequence of removing a top predator from a food web?

    • All plants die
    • Rainfall stops
    • Prey numbers increase
    • Producers disappear

  20. What does the carbon in a dead plant become as it decays?

    • Pure nitrogen gas
    • Solid plastic
    • Carbon dioxide
    • Liquid water

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