Associate Certified Entomologist (ACE) Practice Exam

What are some derivative chemicals of DDT?

1. Chlordane, heptachlor, aldrin, dieldrin

2. Organophosphates, carbamates, pyrethroids

3. Neonicotinoids, phytoalexins, insect growth regulators

4. Herbicides, fungicides, bactericides

The correct answer is: Chlordane, heptachlor, aldrin, dieldrin

DDT, or dichlorodiphenyltrichloroethane, is a pesticide that has been widely studied and is known for its long-lasting effects on ecosystems. It is important to understand that certain chemicals derive directly from or are closely related to DDT's chemical structure and its mode of action. The correct answer identifies a group of synthetic organic compounds that, like DDT, are primarily used for pest control. Chlordane, heptachlor, aldrin, and dieldrin share similar chemical structures and target pest species in comparable ways. They are all part of the class known as chlorinated hydrocarbons (or organochlorines), which were commonly used before their environmental and health impacts became evident. In contrast, the other choices list groups of chemicals that do not have a direct derivation from DDT. Organophosphates and carbamates are distinct classes of insecticides that operate through different mechanisms — mainly by inhibiting enzymes involved in nervous system function. Similarly, pyrethroids are synthetic analogs of pyrethrins, which are derived from chrysanthemum flowers and differ significantly from DDT's chemical structure. Neonicotinoids also target the nervous system but are based on nicotine, making