First-generation pesticides include which of the following?

First-generation pesticides include which of the following?

• A. DDE or organochlorines
• B. Organophosphates and carbamates
• C. Sulfur fumigants used by Greeks, hydrogen cyanide, and heavy metals
• D. Pyrethroids

Answer: (C)

First-generation pesticides are the earliest types used, coming from inorganic or naturally derived sources and used before modern synthetic organics became common. They include sulfur fumigants, hydrogen cyanide, and heavy metal compounds (like arsenic, lead, or copper-based pesticides). These were common in ancient and early modern pest control and in stored-product treatments, but they often carried high toxicity to humans and the environment and had limited selectivity. The listed sulfur fumigants, hydrogen cyanide, and heavy metals fit this early-use pattern, reflecting how pest control relied on basic, highly toxic approaches before more selective synthetic pesticides were developed. The other groups—DDE and organochlorines, organophosphates and carbamates, and pyrethroids—were developed later and represent subsequent generations with different chemistry, toxicity, and environmental profiles.

First-generation pesticides are the earliest types used, coming from inorganic or naturally derived sources and used before modern synthetic organics became common. They include sulfur fumigants, hydrogen cyanide, and heavy metal compounds (like arsenic, lead, or copper-based pesticides). These were common in ancient and early modern pest control and in stored-product treatments, but they often carried high toxicity to humans and the environment and had limited selectivity.

The listed sulfur fumigants, hydrogen cyanide, and heavy metals fit this early-use pattern, reflecting how pest control relied on basic, highly toxic approaches before more selective synthetic pesticides were developed. The other groups—DDE and organochlorines, organophosphates and carbamates, and pyrethroids—were developed later and represent subsequent generations with different chemistry, toxicity, and environmental profiles.