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 MCQs with Answers PDF Download: MCQ Quiz 21
Profuse growth of bacteria results in
- death of algae
- death of aquatic plants
- death of fish
- lesser nutrients in water
Rapid growth of bacteria may
- consume all the oxygen in water
- start living anaerobically
- kill the fish due to oxygen shortage in water
- all of above
Fish can be conserved if
- small fish are not caught
- indiscriminate fishing is done
- fishing period is extended
- fish hasn't laid eggs yet
In humans, the sensitivity of respiratory diseases, eyes, and air passages is experienced due to
- carbon dioxide
- lead
- carbon monoxide
- sulphur dioxide
Substances which can remain in the soil for many years are known as
- microorganisms
- insecticides
- dichloro-triphenyl dichloroethane
- dichloro-diphenyl trichloroethane
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