2.1 Individuals, populations, communities and ecosystems

2.1 Individuals, populations, communities and ecosystems Quiz

IB Environmental Systems and Societies HL: Quiz

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5 questions, one answer each

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  1. 1. Which best describes a population?

    • A. All organisms in an area
    • B. Organisms of one species in the same area at the same time that can interbreed
    • C. Organisms of several species interacting
    • D. The place where organisms live

  2. 2. A first sample marks 20 animals. A second sample of 30 contains 5 marked animals. What is the Lincoln index estimate?

    • A. 75
    • B. 100
    • C. 120
    • D. 150

  3. 3. Which factor is density-dependent?

    • A. A volcanic eruption
    • B. A severe frost
    • C. Competition for food
    • D. A flood

  4. 4. What is a keystone species?

    • A. The most abundant species
    • B. A species with a disproportionate effect on ecosystem stability
    • C. The largest species
    • D. A species that lives in kelp

  5. 5. (HL) The realized niche of a species is:

    • A. Larger than its fundamental niche
    • B. The same as its habitat
    • C. Narrower than its fundamental niche because of competition and other interactions
    • D. The number of offspring it produces

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