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Cambridge IGCSE Biology practice

Paper 3 structured question: Pollution

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3

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5

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Topic

Pollution

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Paper 3Theory (Core)5 marks

Air pollution from methane and carbon dioxide contributes to the enhanced greenhouse effect and climate change.

Description

Sources of Methane and Carbon Dioxide

Methane is released from livestock digestion and landfill decomposition. Carbon dioxide is produced by burning fossil fuels and deforestation.

  1. a

    Identify two sources of methane that contribute to air pollution.

    Aim for approximately 2 distinct marking points.

    [2]
  2. b

    Describe how methane and carbon dioxide contribute to the enhanced greenhouse effect.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 3 structured question: Pollution

Paper 3Theory (Core)3 marks

Description

Consequences of the Enhanced Greenhouse Effect

Climate change results in rising global temperatures, altered weather patterns, and rising sea levels.

  1. a

    State one consequence of climate change caused by the enhanced greenhouse effect.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Describe how burning fossil fuels increases carbon dioxide levels in the atmosphere.

    Aim for approximately 2 distinct marking points.

    [2]