Associate Certified Entomologist (ACE) Practice Exam

What should a Category I signal word include according to regulations?

1. Warning and a yellow triangle

2. Caution and a green circle

3. Danger and a skull and crossbones

4. Attention and a red square

The correct answer is: Danger and a skull and crossbones

A Category I signal word must convey a high level of hazard and is used to indicate that the product is potentially highly toxic or poses a significant risk. The correct answer emphasizes the word "Danger," which is standardized for substances that can cause severe consequences if mishandled. The inclusion of a skull and crossbones symbol with the "Danger" word visually reinforces this high level of risk, signaling users that they must exercise extreme caution while handling the product. In regulatory contexts, "Caution," "Warning," and similar terms are associated with lower hazard categories, indicating less immediate risk and reflected in other choices. For example, "Warning" is typically aligned with Class II materials, and "Caution" with Class III, denoting a tiered approach to toxicity that is not applicable in the case of Category I, which stands out for its urgent danger messaging.