Question

why is the prolonged use of DDT
not desirable ​

Answer 1

ANSWER:-

Human health effects from DDT at low environmental doses are unknown. Following exposure to high doses, human symptoms can include vomiting, tremors or shakiness, and seizures. Laboratory animal studies showed effects on the liver and reproduction. DDT is considered a possible human carcinogen.

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Answer 2

Reason why prolonged use of DDT is not considered as desirable:

The DDT is elaborately called as Dichlorodiphenyltrichloroethane. It is widely used by the farmers as insecticides. Its use was considered as undesirable because it was less soluble in water and it remained more concentrated in the plants and when the plant or its product is consumed it leads to fatal risk.  

Due to its insolubility ability in the water, it remains in the environment for more period of time and when live stocks consume it, it enters the body and gets accumulated in the form of fatty tissues and causes risk.