Chronic toxicity is best described as toxicity that occurs:

• A. Immediately after exposure
• B. After a single exposure
• C. After long-term exposure
• D. During exposure

Answer: (C)

Chronic toxicity means the harmful effects that show up after long-term, repeated exposure to a chemical, often at lower doses, with a delayed onset. The body may accumulate the substance or sustain gradual damage over time, so problems become evident only after months or years. This is different from acute toxicity, where effects appear immediately or soon after a single or short-term exposure, and from exposure during exposure where effects are tied to the ongoing contact. So the description that best fits chronic toxicity is effects that occur after long-term exposure. In pest management, this means that repeated use or prolonged contact with a pesticide can lead to health issues that aren’t obvious from a single exposure.