4.4 Water pollution

4.4 Water pollution Quiz

IB Environmental Systems and Societies HL: Quiz

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5 questions, one answer each

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  1. 1. Which nutrients most commonly cause eutrophication?

    • A. Sodium and chloride
    • B. Nitrates and phosphates
    • C. Calcium and magnesium
    • D. Carbon dioxide and oxygen

  2. 2. What does BOD measure?

    • A. Dissolved oxygen needed by microorganisms to decompose organic matter
    • B. Acidity of water
    • C. Number of fish present
    • D. Amount of plastic in water

  3. 3. Which management action works at the 'reduce at source' level?

    • A. Removing sediment from a lake
    • B. Building a wetland to trap nutrients
    • C. Limiting the use of fertiliser
    • D. Harvesting algae

  4. 4. (HL) Which stage of sewage treatment uses aerobic microorganisms to break down organic matter?

    • A. Primary
    • B. Secondary
    • C. Tertiary
    • D. Screening

  5. 5. (HL) Presence of mayfly nymphs in a river suggests

    • A. heavy organic pollution
    • B. low dissolved oxygen
    • C. good water quality
    • D. high BOD

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