IGCSE O Level Biology MCQs - Chapter 7
Effects of Human Activity on Ecosystem Quiz Questions & Answers PDF Download - 3
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Effects of Human Activity on Ecosystem Exam Questions and Answers PDF Download: Test 3
Problem of solid waste disposal can be reduced through
- recycling
- lesser pollution
- more timber
- population control
Non-toxic, unreactive chemicals used as cooling agents in refrigerators are known as
- chloroflouro bicarbonates
- chloroflourocarbides
- chloroflourocarbonates
- chlorofluorocarbon
Lives of organisms in ecosystem become threatened due to
- urbanization
- industrialization
- introduction of toxics in ecosystem
- rapid housing
If a substance accumulates in a body for a long time, it will be
- passed out through egestion
- passed out through excretion
- become insoluble in water
- passed on to next consumer in food chain
Most fertile layer of soil is
- top layer
- organic layer
- middle layer
- lower layer
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