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🎓 IGCSE Biology - The Complete Course - https://www.tes.com/teaching-resource/resource-12989155 Cambridge IGCSE Chemistry - The Complete Course: 🎓 Complete Teaching Resource (including past exam questions and mark schemes organised by chapter): https://www.tes.com/teaching-resource/resource-13280954 🎓 Student resource (PDF only): https://www.tes.com/teaching-resource/resource-13245244 🎓 All the videos (the complete library on Patreon): https://www.patreon.com/igbiocomplete ☕️ Buy me a coffee - https://www.buymeacoffee.com/ArthurJohnParker Cambridge IGCSE Biology (0610/0970) Chapter 20 - Human influences on ecosystems Topic 20.3 - Pollution For exams in 2023, 2024 & 2025 (core and extended) As always this video follows the Cambridge syllabus exactly and contains absolutely everything you need to know for your final exam! My other channels: @igpecomplete - Cambridge IGCSE PE @ocrpecomplete - OCR GCSE PE Timestamps: 0:00 Contents 0:32 Pollution of aquatic ecosystems 1:04 Non-biodegradable plastics 1:55 Air pollution 3:01 Eutrophication (extended) Core content: - Describe the effects of untreated sewage and excess fertiliser on aquatic ecosystems. - Describe the effects of non-biodegradable plastics, in both aquatic and terrestrial ecosystems. - Describe the sources and effects of pollution of the air by methane and carbon dioxide, limited to: the enhanced greenhouse effect and climate change. Extended content: - Explain the process of eutrophication of water, limited to: • increased availability of nitrate and other ions (e.g. phosphates), • increased growth of producers (algae), • increased decomposition after death of producers, • increased aerobic respiration by decomposers (bacteria), • reduction in dissolved oxygen (deoxygenation), • death of organisms requiring dissolved oxygen in water (e.g. fish).
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