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Cambridge IGCSE Biology practice

Paper 4 structured question: Nutrient cycles

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Nutrient cycles

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Paper 4Theory (Extended)2 marks

Microorganisms perform nitrogen fixation and denitrification in the nitrogen cycle, transforming nitrogen between atmospheric and soil forms.

Description

Nitrogen Fixation and Denitrification

Microorganisms convert nitrogen gas into ammonia (nitrogen fixation) and convert nitrates back into nitrogen gas (denitrification).

  1. a

    Identify one function of microorganisms in nitrogen fixation.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    State one function of microorganisms in denitrification.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 4 structured question: Nutrient cycles

Paper 4Theory (Extended)2 marks

Description

Functions of Microorganisms in the Nitrogen Cycle

Microorganisms contribute to decomposition, nitrification, nitrogen fixation, and denitrification, each playing a role in recycling nitrogen in ecosystems.

  1. a

    Identify one function of microorganisms in the nitrogen cycle related to decomposition.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    State one function of microorganisms in the nitrogen cycle related to nitrification.

    Aim for approximately 1 distinct marking point.

    [1]