Persistent Organic Pollutants (POPs) are best described as those that _____.

• A. They degrade quickly in the environment
• B. They resist breakdown and persist in the environment
• C. They are beneficial
• D. They cannot bioaccumulate

Answer: (B)

Persistent Organic Pollutants are defined by their durability in the environment: they resist breakdown by biological, chemical, and photolytic processes, so they remain for long periods after release. This chemical stability, together with their tendency to dissolve in fats, leads to bioaccumulation in the tissues of organisms and can result in higher concentrations up the food chain. They can also travel long distances through air and water, spreading far from where they were released. So the idea that they resist degradation and persist in the environment is the best description. The other statements don’t fit: they do not degrade quickly, they are not inherently beneficial, and they can and do bioaccumulate.