2.2 Energy and biomass in ecosystems

2.2 Energy and biomass in ecosystems Quiz

IB Environmental Systems and Societies HL: Quiz

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5 questions, one answer each

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  1. 1. What is net productivity?

    • A. Total gain in biomass
    • B. Gross productivity minus losses to respiration
    • C. Energy received from the sun
    • D. The mass of a trophic level

  2. 2. Which is a reason for the limited number of trophic levels?

    • A. Producers are rare
    • B. Energy is lost at each transfer
    • C. Consumers cannot digest plants
    • D. Matter is created at each level

  3. 3. Which pollutant biomagnifies in food chains?

    • A. DDT
    • B. Sucrose
    • C. Oxygen
    • D. Carbon dioxide

  4. 4. (HL) Producers at a hydrothermal vent that use hydrogen sulphide as the energy source are:

    • A. Photoautotrophs
    • B. Chemoautotrophs
    • C. Heterotrophs
    • D. Decomposers

  5. 5. (HL) Producers pass 600 kJ of 5000 kJ to primary consumers. What is the ecological efficiency?

    • A. 8.3 %
    • B. 12 %
    • C. 83 %
    • D. 120 %

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