Nutrient Cycles

Nutrient Cycles Quiz

Spec 19.3 · Cambridge IGCSE Biology: Quiz

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5 questions, one answer each

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  1. 1. What is the role of decomposers?

    • A. Produce energy from sunlight
    • B. Break down dead material and release nutrients
    • C. Fix nitrogen only
    • D. Absorb sunlight for consumers

  2. 2. Which process in the carbon cycle removes CO2 from the atmosphere?

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

  3. 3. Which process converts ammonium ions into nitrate ions?

    • A. Nitrogen fixation
    • B. Nitrification
    • C. Denitrification
    • D. Deamination

  4. 4. Which two things can achieve nitrogen fixation?

    • A. Combustion and respiration
    • B. Lightning and nitrogen-fixing bacteria
    • C. Decomposers and fungi
    • D. Photosynthesis and evaporation

  5. 5. What is deamination?

    • A. Conversion of nitrogen gas into nitrates
    • B. Breakdown of excess amino acids in the liver, producing urea
    • C. Bacterial conversion of nitrate to nitrogen gas
    • D. Absorption of nitrate ions by plant roots

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