Which term describes the increase in chemical concentration in animal tissues as the chemical moves up the food chain?

Which term describes the increase in chemical concentration in animal tissues as the chemical moves up the food chain?

• A. Biomagnification
• B. Bioaccumulation
• C. Point source pollution
• D. Aquatic ecosystem

Answer: (A)

Biomagnification describes how a chemical becomes more concentrated in animal tissues as it moves up the food chain. When a pollutant is persistent and fat‑soluble, it remains in organisms instead of being easily excreted. As small organisms containing the chemical are eaten by predators, the chemical transfers and accumulates in the predator’s tissues. With each step up the trophic levels, the concentration increases, so top predators end up with the highest levels. This is why substances like mercury or certain pesticides show the strongest effects in apex predators. Bioaccumulation, by contrast, is the buildup within a single organism from all sources over time, not specifically about increasing concentrations across feeding levels. Point source pollution refers to pollution from a single identifiable source, and an aquatic ecosystem is the system being studied, not the process of concentration.

Biomagnification describes how a chemical becomes more concentrated in animal tissues as it moves up the food chain. When a pollutant is persistent and fat‑soluble, it remains in organisms instead of being easily excreted. As small organisms containing the chemical are eaten by predators, the chemical transfers and accumulates in the predator’s tissues. With each step up the trophic levels, the concentration increases, so top predators end up with the highest levels. This is why substances like mercury or certain pesticides show the strongest effects in apex predators.

Bioaccumulation, by contrast, is the buildup within a single organism from all sources over time, not specifically about increasing concentrations across feeding levels. Point source pollution refers to pollution from a single identifiable source, and an aquatic ecosystem is the system being studied, not the process of concentration.