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AQA - A/AS Level A level Biology (Specification B)
| Specification Ref.
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| 15.2 | Pollution of aquatic ecosystems | The use of diversity indices and indicator species in monitoring freshwater pollution. The effects of heavy metal ions from industrial effluent on aquatic organisms, and the principles underlying their toxicity. Lethal concentration and lethal dose as methods of assessing toxicity. Persistence and potential for accumulation of heavy metal ions in food webs. The effects of acid rain on aquatic organisms, resulting from the release of aluminium ions and precipitation of phosphates. The sources of sulphur dioxide and nitrogen oxide emissions, and how they contribute to acid rain. The effects of crude oil spillages on aquatic organisms | 4 |
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