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Leaving certificate biology

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  1. Unit 1
    Ecology theory
    5 Topics
    |
    1 Quiz
  2. Nutrient recycling
    4 Topics
    |
    1 Quiz
  3. Ecological relationships and population dynamics
    2 Topics
  4. Human impact on the ecosystem
    2 Topics
  5. Study of a grassland ecosystem
    3 Topics
  6. Responses in the Flowering Plant
    4 Topics
    |
    1 Quiz
  7. Unit 3
    Sexual reproduction in the flowering plant
    1 Topic
  8. The human reproductive system
    3 Topics
  9. The menstrual cycle
    2 Topics
  10. Pregnancy
    2 Topics
  11. The circulatory system
    4 Topics
  12. Blood
    5 Topics
  13. The heart
    5 Topics
Leaving certificate biology Nutrient recycling The carbon cycle
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Lesson 2, Topic 2
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The carbon cycle

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The role of plants in the carbon cycle

  • Plants and algae remove carbon dioxide from the environment through photosynthesis and return it through respiration

The role of animals in the carbon cycle

  • Animals obtain their carbon by eating plants and release carbon during respiration in the form of carbon dioxide

The role of decomposers in the carbon cycle

  • Fungi and bacteria return carbon dioxide  to the environment when they decompose dead organisms

Fossil fuels and the carbon cycle

  • Dead plants and animal material can form fossil fuels such as oil coal and natural gas over millions of years.
  • The carbon in this material is trapped until it is burned through combustion and released into the atmosphere as carbon dioxide

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