• 1. 
    Why does chemical waste need to be disposed of carefully?

  • It encourages excessive plant growth
  • It contains heavy metals which build up in the tissues of living organisms.
  • It is not biodegradable
  • It depletes the oxygen levels in the water
  • 2. 
    What would be an effective way to reduce plastic pollution?

  • Sell plastic waste to countries that need the money
  • Fine people who do not use litter bins
  • Reduce the amount of single-use items we use
  • Cover landfill sites so that plastics do not blow into the ocean
  • 3. 
    What do untreated (raw) sewage and fertilisers have in common?

  • They encourage excessive growth of aquatic plants
  • They are eaten by animals in the water
  • They accumulate in the tissues of aquatic organisms
  • 4. 
    What causes depletion of oxygen during eutrophication?

  • Excessive growth of plants on the surface
  • Death of fish
  • Death of plants beneath the surface
  • Increase of animals eating surface plants.
  • 5. 
    Why is untreated (raw) sewage dangerous to aquatic ecosystems?

  • It contains heavy metals
  • It contains plastics which are not biodegradable
  • It contains high quantities of the minerals needed for plant growth
  • 6. 
    What is a consequence of oxygen depletion during eutrophication?

  • Excessive growth of plants on the surface
  • Death of fish
  • Death of plants under the surface
  • Increase in animals that eat surface plants.
  • 7. 
    What is the biggest danger to humans of discarded rubbish?

  • Plastics break apart into smaller and smaller pieces
  • Animals eat it and it accumulates in their stomachs
  • Animals get stuck or tangled up in it and suffocate
  • We're running out of space in landfill
  • 8. 
    Which of these is not a cause of water pollution?

  • Chemical waste
  • Fertilisers
  • Burning fossil fuels
  • Discarded rubbish
  • 9. 
    As individuals, which of the four causes of water pollution do we have the most power to change?

  • Chemical waste
  • Fertilisers
  • Untreated sewage
  • Discarded rubbish
  • 10. 
    When untreated sewage and fertilisers wash into water, which process results?

  • Bioaccumulation
  • Biomagnification
  • Eutrophication
  • Decomposition
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