IGCSE O Level Biology MCQs - Chapter 7

Effects of Human Activity on Ecosystem Quiz Questions and Answers PDF - 3

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Effects of Human Activity on Ecosystem Questions & Answers PDF Download: MCQ Quiz 3

MCQ 11: Problem of solid waste disposal can be reduced through

recycling
lesser pollution
more timber
population control

MCQ 12: Non-toxic, unreactive chemicals used as cooling agents in refrigerators are known as

chloroflouro bicarbonates
chloroflourocarbides
chloroflourocarbonates
chlorofluorocarbon

MCQ 13: Lives of organisms in ecosystem become threatened due to

urbanization
industrialization
introduction of toxics in ecosystem
rapid housing

MCQ 14: 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

MCQ 15: Most fertile layer of soil is

top layer
organic layer
middle layer
lower layer

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