What characteristic defines inorganic pesticides?

The defining characteristic of inorganic pesticides is that they are derived from minerals. Inorganic pesticides typically consist of natural mineral compounds that can be mined and processed, such as sulfur, copper, and certain metal salts. These substances do not originate from living organisms, which distinguishes them from organic pesticides that are made from carbon-containing compounds often derived from plants or other biological sources.

In contrast, the other options describe properties that do not align with the nature of inorganic pesticides. High levels of carbon are indicative of organic compounds. Biodegradability varies and is more frequently associated with organic pesticides, which can break down more readily in the environment. Exclusively being made from plants would imply organic pesticides as well, while inorganic pesticides may not involve any biological materials at all. Thus, the correct understanding of inorganic pesticides is fundamentally tied to their mineral origins.