Question

Now-a-days use of DDT as insecticide is banned because

• A. It is less effective than other pesticides
• B. Organisms develop resistance to it
• C. Production cost is very high
• D. It has long residual effect

Answer 1

Answer: (D)

It has long residual effect

Dichlorodiphenyltrichloroethane, commonly known as DDT, is a colourless, tasteless, and an almost odourless crystalline chemical compound, an organochlorine, originally developed as an insecticide, and ultimately becoming infamous for its environmental impacts. Opposition to DDT was focused by the 1962 publication of Rachel Carson's book Silent Spring. It catalogued environmental impacts that coincided with the widespread use of DDT in agriculture in the United States, and it questioned the logic of broadcasting potentially dangerous chemicals into the environment leaving the residues for a long time.

So the correct answer is 'It has a long residual effect'.