Question

What is the increase in the concentration of pollutants at the highest trophic level called?

Hint:

Biomagnification refers to the increase in concentration \textit{across} a food chain, whereas Bioaccumulation refers to the build-up of a toxin within a \textit{single} organism over its lifetime.

Answer 1

Step 1: Understanding the Concept:
Certain toxic chemicals, like DDT or heavy metals, are non-biodegradable and tend to accumulate in living tissues.

Step 2: Detailed Explanation:
When these toxins enter an ecosystem, they are taken up by producers.
Because they are not easily metabolized or excreted, they remain in the organism's body.
As organisms are consumed by predators at higher trophic levels, the toxins are concentrated further.
This phenomenon, where the concentration of a toxin multiplies at each successive trophic level, reaching its maximum in apex predators, is known as biological magnification or biomagnification.

Step 3: Final Answer:
The phenomenon is called biomagnification.