CBSE Class 10 Science 2017 · Paper 531 · Question 3
What is meant by ‘biological magnification’ ?
Answer
The concentration of harmful non-biodegradable chemicals increases progressively at each trophic level of a food chain.
Biological magnification is the progressive increase in the concentration of harmful non-biodegradable chemicals, such as some pesticides, in the bodies of organisms at each successive trophic level of a food chain. These chemicals are neither broken down nor excreted, so they accumulate, and their concentration is highest in the organisms at the top of the food chain.
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