Question

Pesticides, such as DDT, often have harmful effects on aquatic ecosystems. One harmful effect would be that these pesticides

Answer 1

C

Pesticides, such as DDT, often have harmful effects on aquatic ecosystems because they accumulate in animals and build up in toxic concentrations as they pass through the food chain. This is referred to as bioaccumulation.

Explanation:

As the DDT is ingested it accumulates in the body tissues because the body of the organisms is unable to break down and excrete the chemicals fast enough or at all. This bioaccumulation also goes up the food chain/web as higher organisms prey on the lower organism on the web. For example, the aphids feed on the leaves sprayed with DDT. They are then preyed on by beetles and flies and bugs. These bugs are then eaten by birds. Eventually, the DDT will be found in the tissues of the birds, even in higher concentrations (due to biomagnification).

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