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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 1, Topic 2
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Factors affecting organisms
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Abiotic factors (non living factors)
Climatic factors
- Light intensity: plants grow better in south facing aspects where there is more light
- Rainfall: all organisms need water to live
- Wind: wind damages plants and stunts their growth
- Temperature: organisms grow faster in higher temperatures
- Humidity: When conditions are too humid, it may promote the growth of mold and bacteria that cause plants to die and crops to fail
- Day length: longer days mean more light and plants can grow better
Aquatic factors (relating to water)
- Light: light may not penetrate far down into water if it is murky
- Currents: currents may wash away algae, plants and animals
- Wave action: waves create currents and physically damage organisms
- Oxygen concentration: There is less oxygen in water than air
Edaphic factors (relating to soil)
- Soil type: some plants tolerate sandy soil (large particles) others tolerate clay soil (small particles)
- Soil moisture: more water means more plant growth
- Air content: air in soil helps roots to grow
- Soil pH: different plants prefer different pH
- Mineral content: the presence of various minerals are needed for plant growth
- Humus content: humus is decaying organic matter, which increases the growth of plants by providing nutrients and oxygen to the plant
Biotic factors (living factors)
- Competition: competition for resources tends to reduce the numbers of organisms
- Predators: predation tends to reduce the number of prey
- Food: the more plants in a habitat the more animals can live there
- Parasitism: parasitism (feeding from a living host) may reduce the numbers of the host organism