Human Influences On The Environment
Visão Geral
Humans have transformed landscapes, altered the composition of the atmosphere, and changed the chemistry of rivers and oceans - all within a few generations. While technology has raised living standards, it has also created pollution, accelerated climate change and driven species toward extinction.
In this lesson you will examine the biological consequences of air and water pollution, trace the mechanism behind the enhanced greenhouse effect, and evaluate the cascading effects of deforestation. These topics are among the most commonly tested on both Edexcel papers, and they connect directly to the carbon cycle and ecosystem concepts you have already studied.
Objetivos
- Understand the biological consequences of pollution of air by sulfur dioxide and carbon monoxide
- Understand that water vapour, carbon dioxide, nitrous oxide, methane and CFCs are greenhouse gases
- Understand how human activities contribute to greenhouse gases
- Understand how an increase in greenhouse gases results in an enhanced greenhouse effect and that this may lead to global warming and its consequences
- Understand the biological consequences of pollution of water by sewage
- Understand the biological consequences of eutrophication caused by leached minerals from fertiliser
- Understand the effects of deforestation, including leaching, soil erosion, disturbance of evapotranspiration and the carbon cycle, and the balance of atmospheric gases
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Irá encontrar uma mistura de tipos de perguntas, incluindo perguntas de escolha múltipla, perguntas de resposta curta e perguntas de redação. Cada pergunta é cuidadosamente elaborada para avaliar diferentes aspetos do seu conhecimento e competências de pensamento crítico.
Use esta secção de avaliação como uma oportunidade para reforçar a tua compreensão do tema e identificar quaisquer áreas onde possas precisar de estudo adicional. Não te deixes desencorajar pelos desafios que encontrares; em vez disso, vê-os como oportunidades de crescimento e melhoria.
- Which gas causes acid rain when it dissolves in rainwater? A) Carbon dioxide B) Carbon monoxide C) Sulfur dioxide D) Methane Answer: C
- What is the main biological effect of carbon monoxide? A) It causes acid rain B) It binds to haemoglobin, reducing oxygen transport C) It causes global warming D) It causes eutrophication Answer: B
- Which of the following is NOT a greenhouse gas? A) Water vapour B) Carbon dioxide C) Nitrogen D) Methane Answer: C
- Eutrophication begins with: A) Sewage entering a river B) Excess fertiliser being leached into water C) Trees being cut down near a lake D) Fish releasing waste into the water Answer: B
- Which of the following is an effect of deforestation? A) Decreased atmospheric CO2 B) Increased soil fertility C) Soil erosion D) Increased biodiversity Answer: C
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