Which of the following is considered the greatest problem associated with the use of pesticides?

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They increase costs for farmers, making it more difficult for them to make a living

The speed with which they kill pest organisms

Modern pesticides are more dangerous to use

Development of genetic resistance in pest organisms

answer is C.

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Detailed Solution

Repeated use of pesticides of same class to control a pest can cause undesirable changes in the gene pool of a pest leading to another form of artificial selection or pesticide resistance.

When a pesticide first used, only a small proportion of population of the pest may survive due to their genetic makeup. These individuals pass the genes for resistance to the next generation.

Frequent use of pesticides increase the proportion of less susceptible individuals in the population.

Through the process of selection, the population slowly develop resistance to the pesticides. So, the genetic resistance in pest organism is the major problem associated to use of pesticides.

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