When
herbivores consume plants containing pesticide residues, some may be retained
by the body and be stored in fatty tissues. Over time, this builds up the
levels within its body. When consumers eat herbivores, they accumulate these
residues from the many that they have eaten. This bioaccumulation continues as
you go up the food chain. This may result in dangerous or lethal levels in the
top consumers, normally carnivores. The top consumer could be a human. Heavy
metals can also accumulate in this way.
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Reference : http://www.beep.ac.uk/content/224.0.html
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