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2 ppm of a pesticide entered in a food chain at the producer level. However, in the apex consumers, 200 ppm of pesticide was identified. The phenomenon that occurred here is:
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Biomagnification
Sewage from homes as well as industries is disposed of in the water bodies. Sewage from certain industries such as chemical manufacturing, paper manufacturing, etc. contains toxic substances such as heavy metals. These heavy metals, when taken by aquatic organisms, cannot be metabolised or excreted and hence, they pass it to higher trophic levels. This leads to an increase in the accumulation of toxic substances at each successive trophic level. This is known as biomagnification.
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