Which scenario illustrates biomagnification?

Which scenario illustrates biomagnification?

• A. A plankton has higher mercury than its predator
• B. A small fish has higher mercury than a larger fish
• C. Mercury concentrations are uniform across all trophic levels
• D. A top predator has higher mercury than its prey

Answer: (D)

Biomagnification happens when a contaminant becomes more concentrated as you move up the food chain, because organisms accumulate it from what they eat and it isn’t easily removed from their bodies. Mercury, especially in its methylated form, is persistent and fat-soluble, so each predator ends up with more mercury than the prey it consumed. The scenario where a top predator has higher mercury than its prey illustrates this stepwise buildup through trophic levels, which is the defining feature of biomagnification. The other ideas don’t fit because they would imply lower or uniform concentrations across levels, which would not show the increasing transfer up the chain.

Biomagnification happens when a contaminant becomes more concentrated as you move up the food chain, because organisms accumulate it from what they eat and it isn’t easily removed from their bodies. Mercury, especially in its methylated form, is persistent and fat-soluble, so each predator ends up with more mercury than the prey it consumed. The scenario where a top predator has higher mercury than its prey illustrates this stepwise buildup through trophic levels, which is the defining feature of biomagnification. The other ideas don’t fit because they would imply lower or uniform concentrations across levels, which would not show the increasing transfer up the chain.