IGCSE O Level Biology MCQs - Chapter 7
Effects of Human Activity on Ecosystem Trivia Questions & Answers PDF Download - 20
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Effects of Human Activity on Ecosystem Exam Questions and Answers PDF Download: Test 20
People may become blind due to
- Lead poisoning
- Mercury poisoning
- Chlorofluorocarbons exposure
- Ozone depletion
Foul smelling gases include
- Hydrogen Sulfide (H2S) only
- Ammonia (NH3)
- Carbon dioxide (CO2) only
- Hydrogen Sulfide (H2S) and Ammonia (NH3)
Volcanic eruptions, biological decay and forest fires releases
- Carbon monoxide in air
- carbon dioxide in air
- sulpher dioxide in air
- ammonia in air
Aluminum (Al) salts may become fatal to fish if allowed to react with
- soil in the rivers
- soil in the lakes
- fossil fuel
- gaseous pollutants like acid rains
Fish die as a result of water pollution due to
- less BOD
- more tolerance range for oxygen
- narrow tolerance range for oxygen
- zero tolerance range for oxygen
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