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Chapter 13: Problem 6

Why are nonpersistent pesticides not as environmentally sound as first thought?

Short Answer

Expert verified
Nonpersistent pesticides were first thought to be environmentally sound due to their rapid degradation rates, minimizing potential long-term environmental effects. However, practices of frequent application means they are often present in high amounts. Besides, their higher toxicity can pose a threat to non-target organisms and disrupt ecosystems. Nonpersistent pesticides can also accumulate within various organisms, leading to bioaccumulation and biomagnification, causing more detriment to the environment and organisms than first perceived.

Step by step solution

01

Understanding Nonpersistent Pesticides

Nonpersistent pesticides refer to pesticides that break down quickly, usually within days or weeks. They were initially considered environmentally friendly due to their short lifespan, thus minimizing their potential long-term impact on the environment.
02

Considering the Application and Use of Nonpersistent Pesticides

Even though nonpersistent pesticides degrade faster than persistent pesticides, their frequent application is necessary to maintain their effectiveness. As a result, the amount of pesticide present in the environment remains high as new applications compensate for the fast degradation.
03

Inspecting the Potential Harm of Nonpersistent Pesticides

Despite their quick degradation, nonpersistent pesticides have been found to be more toxic. They can kill non-target organisms, disrupt ecosystems, and have adverse effects on the health of various species.
04

Learning About Bioaccumulation and Biomagnification

Although nonpersistent pesticides degrade quickly, there are situations where these substances can accumulate in the bodies of organisms faster than they break down. This is referred to as bioaccumulation. When a predator consumes several of these organisms, the pesticide concentration accumulates and magnifies up the food chain-a process known as biomagnification.

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