Pesticides are used on crops to prevent the crops from being eaten by pests such as insects. the chemicals in the pesticides kill the insects. which of the following is a negative effect that could result from the increasing use of pesticides? athe chemicals in the pesticides could run off into water sources and contaminate them, which would kill many aquatic species. b. the chemicals in the pesticides could the plants grow bigger and taller because they are no longer being eaten by pests. c. the chemicals in the pesticides could cause the pests to start eating livestock instead, decreasing the amount of food available to humans. d. the chemicals in the pesticides could kill many insects, resulting in humans having a greater source of food.