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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 4, Topic 1
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Pollution
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What is pollution ?
Pollution is any harmful addition to the environment
Man made examples:
- Litter
- Dumping
- Sewage disposal
- Noise
- Radioactivity
Natural examples:
- Volcanoes
- Smoke from fires
What are pollutants ?
Pollutants are substances that cause harm to the environment
Examples:
- Carbon dioxide
- Sulfur dioxide
- Smoke particles
- Fertilizer
The effects of pollution
- If too much fertiliser is spread on grassland, the fertilizer may get washed into streams, rivers and lakes
- The minerals in the fertiliser cause algae to grow in the water
- When the algae die they are decomposed by bacteria . This uses up oxygen
- All the oxygen in the water gets used up so that all living things die.
- This process is called eutrification
Controlling pollution
- Limit the use of fertiliser
- Animal waste (slurry) should be spread on grassland only when grass is actively growing in spring and when the weather is dry