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, which way do the arrows point?

    • From producers to decomposers only, never to other animals
    • From the food to the organism that eats it
    • From the consumer back to the organism that it eats
    • In both directions equally along every link in the web

  2. What is a producer in a food web?

    • An animal at the very top of the food web and its chain
    • An animal that eats only plants and grows in the wild
    • An organism that breaks down dead material
    • An organism that makes its own food, like a plant

  3. Which organism is a primary consumer in a grassland food web?

    • A rabbit that eats grass
    • A fungus that breaks down dead leaves
    • A fox that eats rabbits
    • A grass plant that makes glucose

  4. What do decomposers do in a food web?

    • Hunt and eat other predators that live in the same area nearby
    • Eat only seeds from plants that grow in the area
    • Make their own food by photosynthesis in the leaves
    • Break down dead matter, returning nutrients to the soil

  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. If all the rabbits in a food web died, what would most likely happen to the fox population?

    • It would decrease because foxes would have less food
    • It would increase because foxes would eat more grass
    • It would stay the same because foxes only eat grass
    • It would increase because the rabbits would produce more energy

  7. If a disease removes many grasshoppers from a meadow, what is most likely to happen to the grass?

    • It will stop producing glucose at night
    • It will become a decomposer
    • It may grow more because fewer grasshoppers are eating it
    • It will die at once because grasshoppers help it photosynthesise

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

    • Top predators are always much smaller than the producers they eat
    • Producers reproduce less often than top predators
    • Only a small share of energy passes from each level to the next
    • Top predators use more light than producers

  9. What is a predator?

    • An organism that breaks down dead material and waste matter
    • A plant that makes its own food using sunlight and water
    • An animal that hunts and kills other animals for food
    • An animal that eats only dead matter found on the ground

  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 more realistic than food chains?

    • They show only one feeding path for each organism at a time
    • They show many interconnected feeding relationships
    • They show only the movement of water between organisms
    • They include only producers and decomposers in the area

  13. Which group recycles nutrients back into the soil?

    • Primary consumers
    • Top predators
    • Herbivores
    • Decomposers

  14. What is a consumer that eats primary consumers called?

    • A decomposer that breaks down dead matter
    • A primary consumer that eats plants
    • A secondary consumer
    • A producer that makes its own food

  15. Why does a top predator need a large area to find enough food?

    • It needs many prey, as little energy passes up
    • It needs space to store glucose as starch in its body
    • It needs room for its decomposers to break down its waste
    • It needs a large area to photosynthesise in the sun

  16. What are the food webs of an ecosystem made from?

    • Feeding links between producers, consumers and decomposers
    • The movement of water in rivers only
    • Only the energy from the Sun
    • Chemical reactions between minerals and water in the soil layers

  17. What would happen to the number of producers if a large number of herbivores were removed?

    • Producers would become predators
    • Producers would stop photosynthesising
    • Producers would fall to zero straight away
    • Producers would likely increase in number

  18. Which organism is most likely a secondary consumer?

    • A frog that eats insects
    • A fungus that grows on dead wood
    • A seed that falls to the ground
    • A plant that grows in the sun

  19. Why would removing a top predator from a food web affect other organisms?

    • Producers would stop photosynthesising immediately after it
    • Prey numbers may rise, changing food for other species
    • Primary consumers would start making their own food from light
    • Decomposers would have no dead matter at all to break down

  20. What happens to the carbon in a dead plant as it decays?

    • It returns to the air or soil as carbon dioxide and minerals
    • It is stored permanently in the plant's thick cell walls for ever
    • It is absorbed directly as glucose by the roots of nearby plants
    • It is converted into oxygen gas by the decomposers in the soil

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