Explain the concept of bioaccumulation and provide a representative example.

• A. Bioaccumulation is the rapid breakdown of toxins.
• B. Bioaccumulation is the process by which organisms convert toxins into less harmful forms.
• C. Bioaccumulation occurs when toxins are produced by the organism.
• D. Bioaccumulation is the buildup of substances in an organism over time.

Answer: (D)

Bioaccumulation means a substance from the environment builds up in an individual organism over time because it is taken in faster than it is eliminated. This leads to higher concentrations inside the organism than in its surroundings. The option described best fits this idea: substances persist and accumulate in the body rather than rapidly breaking down, being detoxified, or being produced by the organism itself. A classic example is DDT, a pesticide that stays in the environment and is fat-soluble. It accumulates in an animal’s fatty tissues and is not easily excreted, so its concentration increases with time and through the organism’s diet. In birds of prey, this buildup can disturb calcium metabolism and cause eggshell thinning, illustrating the real-world impact of bioaccumulation.