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increase concentration in toxic substances in the envirnment as they pass through successive tropic levels. for example the increase of toxins in the water souces such as river and ponds causes the death of algae and fishes which disturbs the food chain.
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The phenomenon of harmful chemicals through different trophic levels is known as biological magnification.
The pesticides and other chemicals used to protect our crops are either washed down into the soil or into the water bodies. From the soil, these are absorbed by the plants along with the water and minerals, and from the water bodies these are taken up by aquatic plants and animals. This is one of the ways in which they enter the food chains. As these chemicals are not degradable, these get accumulated progressively at each trophic level. As human beings occupy the top level in any food chains, the maximum concentration of these chemicals get accumulated in our bodies.
The pesticides and other chemicals used to protect our crops are either washed down into the soil or into the water bodies. From the soil, these are absorbed by the plants along with the water and minerals, and from the water bodies these are taken up by aquatic plants and animals. This is one of the ways in which they enter the food chains. As these chemicals are not degradable, these get accumulated progressively at each trophic level. As human beings occupy the top level in any food chains, the maximum concentration of these chemicals get accumulated in our bodies.
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