O Level Courses

Chapter 7: IGCSE O Level Biology Exam Tests

IGCSE O Level Biology MCQs - Chapter 7

Effects of Human Activity on Ecosystem Multiple Choice Questions (MCQs) PDF Download - 21

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Effects of Human Activity on Ecosystem Questions and Answers PDF Download: MCQ Quiz 21

MCQ 101:

Profuse growth of bacteria results in

  1. death of algae
  2. death of aquatic plants
  3. death of fish
  4. lesser nutrients in water
MCQ 102:

Rapid growth of bacteria may

  1. consume all the oxygen in water
  2. start living anaerobically
  3. kill the fish due to oxygen shortage in water
  4. all of above
MCQ 103:

Fish can be conserved if

  1. small fish are not caught
  2. indiscriminate fishing is done
  3. fishing period is extended
  4. fish hasn't laid eggs yet
MCQ 104:

In humans, the sensitivity of respiratory diseases, eyes, and air passages is experienced due to

  1. carbon dioxide
  2. lead
  3. carbon monoxide
  4. sulphur dioxide
MCQ 105:

Substances which can remain in the soil for many years are known as

  1. microorganisms
  2. insecticides
  3. dichloro-triphenyl dichloroethane
  4. dichloro-diphenyl trichloroethane

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