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9 Cards in this Set
- Front
- Back
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Biodiversity |
The variety of all different species or organisms in an ecosystem. |
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Why is a high biodiversity good? |
Reduces the dependence and f one species on another for food, shelter and the maintenance of the physical environment. |
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How has an increase in human population effected biodiversity? |
Increases the amount of recourses, waste and space needed which reduces the land available for other animals. |
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How do humans reduce the amount of land available for other animals or plants? |
Quarrying, farming and dumping waste. |
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How is pollution caused in water? |
From sewage, fertilisers or toxic chemicals. |
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How does pollution affect biodiversity? |
Kills plants and animals, which reduces biodiversity. |
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How is pollution caused on land? |
Landfill and from toxic chemicals such as pesticides and herbicides. These can also be washed from land into water. |
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Bioaccumulation |
Where toxins enter the food chain. Initially, the amount ingested is small; but as it travels up the food chain for toxins build up in the organisms. It can lead to dangerous levels of toxins accumulating in the top predator. |
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How is acid rain formed? |
When fossil fuels are burnt, acidic gases form. Sulphur dioxide forms as it reacts with the air and aswell as nitrogen, can dissolve into rainwater. Producing acid rain. |
