IGCSE O Level Biology MCQs - Chapter 7

Effects of Human Activity on Ecosystem Trivia Questions and Answers PDF - 20

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Effects of Human Activity on Ecosystem Questions & Answers PDF Download: MCQ Quiz 20

MCQ 96: People may become blind due to

Lead poisoning
Mercury poisoning
Chlorofluorocarbons exposure
Ozone depletion

MCQ 97: Foul smelling gases include

Hydrogen Sulfide (H₂S) only
Ammonia (NH₃)
Carbon dioxide (CO₂) only
Hydrogen Sulfide (H₂S) and Ammonia (NH₃)

MCQ 98: Volcanic eruptions, biological decay and forest fires releases

Carbon monoxide in air
carbon dioxide in air
sulpher dioxide in air
ammonia in air

MCQ 99: 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

MCQ 100: 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

IGCSE O Level Biology Mock Tests

Excretion: O Level Biology MCQs

Nutrition in General MCQs

Effects of Human Activity on Ecosystem MCQs

Nutrition in mammals MCQs

Biology: Biotechnology MCQs

Nutrition in Plants MCQs

Co-ordination and Response: Animal Receptor Organs MCQs

Transport of Materials in Flowering Plants MCQs

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