Wyoming Pesticide Applicator Practice Test 2026 – Complete Exam Prep

In this context, the question is asking about how the amount of chemical is expressed in or on food, plants, or animals. The statement provided indicates that one part per billion equals 1 pound in 500,000. This relationship is a common way to express very small concentrations of substances. Parts per billion (PPB) is a unit of measurement used to represent extremely low concentrations of a substance. In this case, with one part per billion equaling 1 pound in 500,000, it exemplifies how a minute quantity of a chemical can be present in a large quantity of food, plants, or animals.

Other options such as Pathogen, Parts Per Million (PPM), and Larvicide are not relevant to the specific measurement relationship described in the question. So, the correct answer is D, Parts Per Billion (PPB), as it directly aligns with the ratio provided in the question.