A pesticide that functions as a gas and is highly toxic to humans is called what?

• A. Fumigant
• B. Insecticide
• C. Fungicide
• D. Herbicide

Answer: (A)

Fumigants are pesticides that are used as gases. They volatilize and spread through air, soil, or enclosed spaces to reach pests that are hidden or buried, delivering their toxic effect as a gas. Because of their gaseous form and high toxicity to humans, fumigants require strict safety measures, specialized equipment, and typically restricted-use labeling. This combination distinguishes them from other pesticide types, which are usually liquids or solids applied directly to target pests like insects, fungi, or weeds. Insecticides kill insects, fungicides kill fungi, and herbicides kill unwanted plants; none are defined by functioning as a gas in the same way fumigants are.