Which statement best describes the persistence of organochlorine pesticides?

• A. Highly lipid-soluble and persistent in the environment, favoring bioaccumulation up the food chain
• B. Water-soluble and rapidly degraded
• C. Non-persistent and non-bioaccumulative
• D. Only affect aquatic life

Answer: (D)

Persistence of organochlorine pesticides is driven by their chemical properties: they are highly lipid-soluble and resistant to environmental degradation. Their affinity for fats causes them to accumulate in the fatty tissues of organisms, while their slow breakdown means they linger in soil, sediment, and water for years. As they move through the food chain, concentrations increase at higher trophic levels—a process known as biomagnification—so effects can propagate through multiple species, not just one. This makes them a long-lasting environmental and health concern, with exposure potential across ecosystems, including humans. Statements describing them as water-soluble and rapidly degraded, non-persistent and non-bioaccumulative, or limited to aquatic life do not fit these properties and observed effects.