Global environmental problems — A/L Biology

How do I practise Global environmental problems?

1 question with a worked solution

1. Which pair of anthropogenic gaseous emissions is primarily responsible for the acidification of precipitation, resulting in wet acid deposition with pH values below 5.6?
   1. A) Carbon monoxide (CO) and Tropospheric ozone (O₃)
   2. B) Carbon dioxide (CO₂) and Methane (CH₄)
   3. C) Chlorofluorocarbons (CFCs) and Halons
   4. D) Sulfur dioxide (SO₂) and Nitrogen oxides (NOₓ)
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   Correct answer: D) Sulfur dioxide (SO₂) and Nitrogen oxides (NOₓ)

   Sulfur dioxide (SO₂) from coal-fired power plants and nitrogen oxides (NO and NO₂) from vehicle exhaust react with atmospheric water vapor, hydroxyl radicals, and oxygen to form dilute sulfuric acid (H₂SO₄) and nitric acid (HNO₃), lowering rain pH well below the natural unpolluted benchmark of 5.6.

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   Step 1: Differentiate environmental phenomena: - Global warming: CO₂, CH₄, N₂O. - Ozone depletion: CFCs, halons. - Acid rain: SO₂ and NOₓ reacting to form H₂SO₄ and HNO₃. Answer: Sulfur dioxide (SO₂) and Nitrogen oxides (NOₓ).
   Modelled on: the A/L Biology examination pattern

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Where does Global environmental problems fit in the syllabus?

Year 2 · Term 2