Biology - 4BI1 PearsonEdexcel

Human Influences On The Environment

Muhtasari

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.

Malengo

  1. Understand the biological consequences of pollution of air by sulfur dioxide and carbon monoxide
  2. Understand that water vapour, carbon dioxide, nitrous oxide, methane and CFCs are greenhouse gases
  3. Understand how human activities contribute to greenhouse gases
  4. Understand how an increase in greenhouse gases results in an enhanced greenhouse effect and that this may lead to global warming and its consequences
  5. Understand the biological consequences of pollution of water by sewage
  6. Understand the biological consequences of eutrophication caused by leached minerals from fertiliser
  7. 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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Maelezo ya Somo

The global human population has grown exponentially over the last 150 years, driven by better food production, improved medicine and higher living standards. As the population grows, so does our demand for energy, land and resources. The by-products of meeting that demand - factory emissions, agricultural runoff, deforestation - are altering ecosystems on every continent. Understanding these impacts is the first step toward reducing them.

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Tathmini ya Somo

Hongera kwa kukamilisha somo la Human Influences On The Environment. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.

Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.

Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.

  1. Which gas causes acid rain when it dissolves in rainwater? A) Carbon dioxide B) Carbon monoxide C) Sulfur dioxide D) Methane Answer: C
  2. 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
  3. Which of the following is NOT a greenhouse gas? A) Water vapour B) Carbon dioxide C) Nitrogen D) Methane Answer: C
  4. 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
  5. 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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Vitabu Vinavyopendekezwa

Pearson Edexcel International GCSE (9-1) Biology Student Book
Pearson Edexcel International GCSE (9-1) Biology Student Book
Manukuu: First edition
Mchapishaji: Pearson Education
Mwaka: 2017
ISBN: 978-0-435-18426-5
Maelezo: Endorsed student book covering the full 4BI1 specification.

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