What is the role of signal words on pesticide labels?

The role of signal words on pesticide labels is to indicate the toxicity level of the pesticide. These signal words are essential for ensuring safe handling and application of the product. They serve as clear indicators of the potential risks associated with the pesticide, helping users understand the precautions they need to take. For example, common signal words include "Caution," "Warning," and "Danger," which sequentially represent increasing levels of toxicity. This information is crucial for both applicators and consumers to make informed decisions and to implement appropriate safety measures while using the product.

The other options, such as providing nutritional information, showing the cost of the product, or indicating an expiry date, do not pertain to the function of signal words. Pesticide labels are primarily focused on safety and usage guidelines rather than nutritional content, pricing, or product shelf life, emphasizing the importance of understanding toxicity in the context of pest control.