Final answer:
The statement is True; Category II pesticides must have the signal word "Warning" on their labels. This indicates moderate toxicity as classified by the US EPA, with different signal words representing varying levels of toxicity.
Step-by-step explanation:
The statement that Category II pesticides must be labeled with the signal word "Warning" is True. According to the US Environmental Protection Agency (EPA) classification for pesticides, they are categorized based on their relative toxicity. Category I is the most toxic, requiring a "Danger" label, often followed by the word "Poison" along with a skull and crossbones symbol. Category II pesticides are moderately toxic and should be labeled with the "Warning" signal word. Following down the line, Category III pesticides are less toxic and only require the word "Caution" on their labels, while Category IV includes the least toxic pesticides and may also use "Caution" on their labels without a required signal word.
It is important for consumers and applicators of pesticides to be aware of these classifications, as they indicate the relative health risks associated with the product's use. The signal words "Danger", "Warning", and "Caution" serve as quick references to indicate the potential for acute harm from these chemicals.