Which of the following substances is considered botanical?

Pyrethrum is considered a botanical substance because it is derived from the dried flower heads of certain chrysanthemum species, particularly Chrysanthemum cinerariifolium. This natural origin categorizes it as a botanical insecticide, which is used for its pest control properties. Pyrethrum acts by disrupting the nervous system of insects, making it effective against a wide variety of pests while being considered less toxic to humans and pets compared to many synthetic pesticides.

In contrast, Diazinon, Chlordane, and Diphacinone are all synthetic chemicals or compounds that do not originate from plant sources. Diazinon is an organophosphate insecticide, while Chlordane is a chlorinated hydrocarbon that has been banned in many countries due to its environmental and health effects. Diphacinone, on the other hand, is a rodenticide that falls under the category of anticoagulant poisons. Since these substances are not derived from botanical sources, they do not fit the criteria for being classified as botanical substances.