True or False: Acute toxicity measures how harmful a pesticide is from a single exposure.

Acute toxicity is defined as the harmful effects that result from a single exposure to a substance, such as a pesticide. This type of toxicity is usually evaluated based on the immediate effects seen within a short time frame following exposure, typically within 24 hours. The measurement is often represented by the LD50 value, which indicates the dosage required to kill 50% of a test population. Therefore, stating that acute toxicity measures how harmful a pesticide is from a single exposure is indeed accurate.

The focus on acute exposure is important for understanding the risks associated with pesticides for both humans and animals alike, as immediate effects can vary significantly based on the specific characteristics of the pesticide and the organism exposed.