Biomagnification is most likely to occur with which type of pollutant?

• A. Heavy metals
• B. Persistent, fat-soluble pollutants
• C. Water-soluble nutrients
• D. Non-persistent pollutants

Answer: (B)

Biomagnification happens when a contaminant resists breakdown and builds up in organisms, becoming more concentrated at higher levels of the food chain. The substances most prone to this are persistent and fat-soluble, meaning they don’t break down easily and tend to accumulate in fatty tissues. When predators eat many prey containing the contaminant, it passes along and concentrates because it is retained over time and stored in fat, leading to higher levels in top predators. This is why persistent, fat-soluble pollutants like certain pesticides and PCBs are the classic drivers of biomagnification. In contrast, water-soluble nutrients are excreted or used up more readily, and non-persistent pollutants degrade before they can accumulate through multiple trophic transfers.