GCSE Biology (AQA)

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The Carbon Cycle

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Ecology Organisation of an Ecosystem

The Carbon Cycle

3:06 Cycling of Materials
Spec 4.7.2.2
Previous Ecosystem Cycles Next The Water Cycle
  • Carbon is essential for life, found in molecules like glucose, carbon dioxide, and proteins.
  • Carbon bonds with hydrogen, oxygen, and nitrogen in various forms.
  • The carbon cycle includes carbon in forms like carbon dioxide, glucose, and methane.
  • Carbon dioxide consists of one carbon atom bonded to two oxygen atoms.
  • Glucose is composed of six carbon atoms, twelve hydrogen atoms, and six oxygen atoms.
  • Methane contains one carbon atom bonded to four hydrogen atoms.
  • The carbon cycle involves photosynthesis, respiration, decay, and combustion.
  • Photosynthesis uses carbon dioxide to produce glucose, contributing to plant biomass.
  • Respiration by animals and plants releases carbon dioxide back into the atmosphere.
  • Decay and combustion of organic matter and fossil fuels release carbon back into the air.
  • Decomposition processes release carbon dioxide and can produce methane.
  • Combustion of fossil fuels releases stored carbon as carbon dioxide.

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