Organic pesticides are defined as those that:

• A. Contain carbon in their chemical structure
• B. Do not contain carbon
• C. Are always synthetic
• D. Are always water-based

Answer: (A)

In pesticide chemistry, organic means carbon-containing compounds, so an organic pesticide is one that has carbon in its chemical structure. This carbon backbone is what distinguishes organic pesticides from inorganic ones, which lack carbon in their structure. Many organic pesticides come from natural sources, like plant oils or other carbon-based substances, while others are synthetic carbon-based chemicals. The defining idea is the presence of carbon; carbon-free compounds would be classified as inorganic. The other statements aren’t correct because being carbon-free would make something inorganic, being always synthetic would exclude natural organic pesticides, and being always water-based is not a defining feature of organic pesticides.