Cycles within Ecosystems

Cycles within Ecosystems Quiz

Spec 9.12–15 · Edexcel GCSE Biology: Quiz

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5 questions, one answer each

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  1. 1. Which process removes CO2 from the atmosphere?

    • A. Respiration
    • B. Combustion
    • C. Photosynthesis
    • D. Decomposition

  2. 2. Which desalination method forces seawater through a membrane?

    • A. Distillation
    • B. Reverse osmosis
    • C. Condensation
    • D. Precipitation

  3. 3. Farmer alternates beans and wheat with no fertiliser. Why does this maintain nitrates?

    • A. Beans absorb nitrates from wheat
    • B. Beans' root nodules have nitrogen-fixing bacteria adding nitrogen compounds
    • C. Wheat stores nitrates for beans
    • D. Beans prevent denitrifying bacteria

  4. 4. River has stonefly larvae and shrimp, no bloodworms. What does this suggest?

    • A. Heavily polluted, low oxygen
    • B. High oxygen, relatively clean water
    • C. High nitrate levels
    • D. Water too cold for decomposers

  5. 5. 240g sample: 160g at day 4, 100g at day 8. Rate between day 4-8?

    • A. 20g/day
    • B. 15g/day
    • C. 10g/day
    • D. 17.5g/day

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