True or False: A category one pesticide is slightly toxic and has the signal word "caution" on its label.

A category one pesticide is classified as highly toxic, and it typically carries the signal word "danger," indicating a significant risk if mishandled or misused. The "caution" signal word is associated with pesticides that fall under category four, which are considered slightly toxic. Therefore, the statement that a category one pesticide is slightly toxic is not accurate. Understanding these classifications is critical for safe pesticide use and awareness of the associated risks.