Explain bioaccumulation with respect to non-biodegradable substances.

Bioaccumulation refers to the gradual buildup of non-biodegradable substances, such as heavy metals and synthetic chemicals, within the tissues of living organisms over time. These substances cannot be broken down or eliminated efficiently, so their concentration increases with continuous exposure.

Non-biodegradable pollutants like mercury, lead, pesticides (e.g., DDT), and industrial chemicals enter ecosystems through air, water, or soil. When organisms absorb these substances-either directly from the environment or through food-they begin to store them in tissues such as fat, liver, or muscles.

Unlike biodegradable substances, these toxins persist in the body because metabolic processes cannot degrade them. As a result, even small exposures over time can lead to high internal concentrations.

Bioaccumulation becomes more critical when it affects organisms at higher trophic levels. Predators consume multiple contaminated prey, leading to even greater toxin buildup, which can impair physiological functions, reproduction, and survival.

In humans, bioaccumulation of toxic substances can lead to serious health issues, including neurological disorders, organ damage, and developmental problems.

Overall, bioaccumulation highlights the long-term risks of non-biodegradable pollutants and their persistent impact on ecosystems and human health.