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Cambridge IGCSE Biology practice

Paper 3 structured question: Nutrient cycles

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Nutrient cycles

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Paper 3Theory (Core)2 marks

Carbon moves through living organisms and the environment in a cycle involving several key processes.

Description

Carbon Cycle Processes

Carbon is transferred through feeding, respiration, decomposition, fossil fuel formation, and combustion.

  1. a

    Identify Identify two processes that release carbon dioxide into the atmosphere.

    Aim for approximately 2 distinct marking points.

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Paper 3 structured question: Nutrient cycles

Paper 3Theory (Core)2 marks

Diagram Description

Simplified Carbon Cycle

The diagram shows carbon moving between the atmosphere, plants, animals, soil, and fossil fuels through processes such as photosynthesis, respiration, feeding, decomposition, fossil fuel formation, and combustion.

ProcessDescription
PhotosynthesisPlants take in carbon dioxide from the atmosphere.
RespirationPlants and animals release carbon dioxide into the atmosphere.
FeedingAnimals obtain carbon by eating plants.
DecompositionDead organisms are broken down, returning carbon to soil and air.
Fossil fuel formationDead organisms form fossil fuels over millions of years.
CombustionBurning fossil fuels releases carbon dioxide.
  1. a

    Describe Describe the role of photosynthesis in the carbon cycle.

    Aim for approximately 2 distinct marking points.

    [2]