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Leaving certificate biology
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Unit 1Ecology theory5 Topics|1 Quiz
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Nutrient recycling4 Topics|1 Quiz
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Ecological relationships and population dynamics2 Topics
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Human impact on the ecosystem2 Topics
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Study of a grassland ecosystem3 Topics
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Responses in the Flowering Plant4 Topics|1 Quiz
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Unit 3Sexual reproduction in the flowering plant1 Topic
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The human reproductive system3 Topics
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The menstrual cycle2 Topics
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Pregnancy2 Topics
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The circulatory system4 Topics
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Blood5 Topics
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The heart5 Topics
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
