Texas Pesticide Applicator Practice Exam

Which of the following is a characteristic of persistent pesticides?

1. They decompose quickly

2. They are easily absorbed by plants

3. They remain in the environment longer

4. They are harmful to beneficial insects

The correct answer is: They remain in the environment longer

Persistent pesticides are characterized by their ability to remain in the environment for extended periods without breaking down. This durability can lead to prolonged exposure risks for non-target organisms, including beneficial insects, plants, and even humans. Because they do not decompose quickly, these pesticides can accumulate in the soil, water, and food sources, potentially leading to long-term ecological impacts. While some persistent pesticides may also be harmful to beneficial insects, this is not a defining characteristic of persistence itself. The rate of absorption by plants can vary and does not relate directly to the persistence of the pesticide. Therefore, the most accurate characteristic associated with persistent pesticides is their longevity in the environment, making the correct answer clear.