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IGCSE O Level Biology MCQs – Practice Test 15 (Chapter 7)

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Effects of Human Activity on Ecosystem Exam Questions and Answers PDF Download: Test 15

MCQ 71: Use of chemical fertilizers causes:

  1. gaseous pollution
  2. water pollution
  3. air pollution
  4. soil pollution

MCQ 72: Major gaseous man-caused pollutant is:

  1. carbon dioxide
  2. carbon monoxide
  3. sulphur dioxide
  4. nitrogen oxides

MCQ 73: Untreated sewage may cause:

  1. outbreak of epidemic
  2. cholera outbreaks
  3. typhoid outbreaks
  4. all of above

MCQ 74: BOD measures the amount of:

  1. bacteria in a given sample of water
  2. algae being decomposed in a given sample
  3. oxygen bacteria need to decompose organic matter in a given sample
  4. oxygen bacteria need to decompose organic matter in a given sample in a fixed period of time

MCQ 75: Reaction between sulfur dioxide and oxygen results in:

  1. sulfuric acid only
  2. acid rain only
  3. alkali rain
  4. sulfuric acid and acid rain

Effects of Human Activity on Ecosystem Quiz App & e-Book – IGCSE O Level Biology Study Material

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