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10th grade ecosystems and food chains

10th grade (Year 11 in England) · 16 questions · Common Core: NGSS.HS-LS2-1, NGSS.HS-LS2-2, NGSS.HS-LS2-7, NGSS.HS-LS4-6 · England: KS4 Combined Science: Ecosystems, GCSE Combined Science: Ecology

Name

Date

Score/ 16

  1. Question 1

    Food lasts longer in a fridge. Why?

    • A. Low temperature slows the enzymes of decomposers
    • B. Fridges remove all water
    • C. Cold kills every microorganism
    • D. Fridges add preservatives

  2. Question 2

    Draining peat bogs to sell peat as garden compost harms the climate. Why?

    • A. It creates acid rain
    • B. Peat absorbs too much oxygen
    • C. It makes the ozone layer thicker
    • D. Decaying or burned peat releases stored carbon as carbon dioxide

  3. Question 3

    A survey found 300 breeding pairs of a bird species in 2010 and 225 in 2024. What was the percentage decrease?

    Answer%

  4. Question 4

    A bag of grass clippings had a mass of 100 g. After 10 days in a compost bin its mass was 70 g. What was the mean rate of decay, in g per day?

    Answer

  5. Question 5

    The mean number of buttercups in a 0.25 m² quadrat is 8. The field is 100 m². Estimate the number of buttercups in the field.

    Answer

  6. Question 6

    Why should quadrats be placed at random?

    • A. To avoid bias, so the sample represents the whole area
    • B. To find the most plants
    • C. So the results are always the same
    • D. Because it is quicker

  7. Question 7

    Decay: which statement is NOT true?

    • A. Compost can be used as a natural fertiliser.
    • B. Decomposers include bacteria and fungi.
    • C. Decomposers need no oxygen at all.
    • D. Decay is faster when it is warm and moist.

  8. Question 8

    Biodiversity: which statement is NOT true?

    • A. Fertiliser running into lakes can cause algae to grow and oxygen to fall.
    • B. Global warming is changing where some species can live.
    • C. Breeding programmes can help protect endangered species.
    • D. Biodiversity means the number of individuals of one species.

  9. Question 9

    Five 1 m² quadrats contained these numbers of daisies: 9, 7, 12, 7, 10. What is the mean number of daisies per quadrat?

    Answer

  10. Question 10

    A biogas generator lets waste decay without oxygen. What useful gas does it produce?

    • A. helium
    • B. methane, which can be burned as a fuel
    • C. oxygen
    • D. nitrogen

  11. Question 11

    Rewilding projects reintroduce species such as beavers. What can beavers do for an ecosystem?

    • A. They remove all fish
    • B. They have no effect
    • C. They make rivers flow faster
    • D. Their dams create wetlands that support many other species and reduce flooding downstream

  12. Question 12

    A survey found 150 breeding pairs of a bird species in 2010 and 90 in 2024. What was the percentage decrease?

    Answer%

  13. Question 13

    A bag of grass clippings had a mass of 120 g. After 8 days in a compost bin its mass was 108 g. What was the mean rate of decay, in g per day?

    Answer

  14. Question 14

    The mean number of buttercups in a 1 m² quadrat is 14. The field is 50 m². Estimate the number of buttercups in the field.

    Answer

  15. Question 15

    Which is an abiotic factor?

    • A. a new disease
    • B. number of predators
    • C. competition from other plants
    • D. light intensity

  16. Question 16

    Decay: which statement is NOT true?

    • A. Decay returns mineral ions to the soil.
    • B. Decomposers include bacteria and fungi.
    • C. Decay is faster when it is warm and moist.
    • D. Decomposers create new atoms of carbon.

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  1. Low temperature slows the enzymes of decomposers
  2. Decaying or burned peat releases stored carbon as carbon dioxide
  3. 25 %
  4. 3
  5. 3200
  6. To avoid bias, so the sample represents the whole area
  7. Decomposers need no oxygen at all.
  8. Biodiversity means the number of individuals of one species.
  9. 9
  10. methane, which can be burned as a fuel
  11. Their dams create wetlands that support many other species and reduce flooding downstream
  12. 40 %
  13. 1.5
  14. 700
  15. light intensity
  16. Decomposers create new atoms of carbon.