Science 7 · Unit 7: Microorganisms in the environment · Cambridge Lower Secondary Science Stage 7

Questions

1. 1. Which word means "an organism so small it cannot be seen without a microscope"?

   • food web
   • decomposer
   • microorganism
   • producer
   Check

2. 2. Which word means "a diagram showing how energy passes from one organism to another"?

   • producer
   • decomposer
   • food web
   • microorganism
   Check

3. 3. Which word means "an organism that feeds on decaying organic matter"?

   • decomposer
   • producer
   • herbivore
   • food web
   Check

4. 4. In a meadow, grasshoppers and caterpillars eat grass. Which is the producer?

   • grasshoppers
   • grass
   • caterpillars
   • hawks
   Check

5. 5. In the meadow, which animals eat grass?

   • small birds and grasshoppers
   • lizards and small birds
   • hawks and lizards
   • grasshoppers and caterpillars
   Check

6. 6. In the meadow, what do lizards eat?

   • grass
   • hawks
   • grasshoppers
   • caterpillars
   Check

7. 7. In the meadow, what eats caterpillars?

   • small birds
   • lizards
   • grasshoppers
   • grass
   Check

8. 8. In the meadow, lizards eat grasshoppers and small birds eat caterpillars. What do hawks eat?

   • grass
   • only lizards
   • grasshoppers and caterpillars
   • lizards and small birds
   Check

9. 9. In the meadow food web, which animal is not eaten by any other animal?

   • the small bird
   • the hawk
   • the lizard
   • the grasshopper
   Check

10. 10. Which food chain is part of the meadow food web?

    • hawk → small bird → caterpillar → grass
    • grass → caterpillar → small bird → hawk
    • grass → lizard → grasshopper → hawk
    • caterpillar → grass → hawk
    Check

11. 11. In the meadow food web, which organisms do decomposers feed on?

    • only the hawks
    • all the dead organisms and their waste
    • only living animals
    • only the grass
    Check

12. 12. What is the ecological role of decomposers?

    • They break down dead organisms and waste, returning nutrients to the soil.
    • They make food from sunlight.
    • They eat living plants.
    • They hunt other animals.
    Check

13. 13. What would happen to dead leaves if there were no decomposers?

    • They would become producers.
    • They would turn back into living leaves.
    • They would pile up, and nutrients would not return to the soil.
    • They would disappear anyway.
    Check

14. 14. Decomposers return nutrients to the soil. How does this help plants?

    • Plants use the nutrients to help them grow.
    • It makes the soil too dry for plants.
    • Plants eat the decomposers.
    • It stops plants from growing.
    Check

15. 15. Which microorganisms are often decomposers?

    • viruses only
    • plants and algae
    • bacteria and fungi
    • earthworms and snails
    Check