Mosquitoes Have Been Controlled in Most Parts of the World

question 93

Multiple Choice

Mosquitoes have been controlled in most parts of the world by the spraying of DDT.But after years of repeated sprayings,the number of mosquitoes has been increasing in spite of the continued use of DDT because:

• A)each new generation of mosquitoes grew up with DDT as a part of the environment and gradually developed immunity
• B)mosquitoes exposed to nonlethal concentrations of DDT learned to avoid food and other matters sprayed with DDT
• C)DDT-resistant mosquitoes survived to breed,as did their offspring,until more and more of each year's mosquitoes were resistant
• D)none of the above

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Definitions:

Demand Schedule

A table that shows the quantity of a good or service that consumers are willing and able to purchase at different prices.

Rent-Seeking Activity

Rent-Seeking Activity involves individuals or entities attempting to obtain economic rent by manipulating the social or political environment in which economic activities occur, rather than creating new wealth.

Demand Schedule

A table or graph showing the quantity of a good that buyers wish to purchase at various prices.

Natural Monopoly

A market structure where a single firm can supply a good or service to an entire market at a lower cost than two or more firms, often due to high fixed or infrastructure costs.