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

Options

A. it is less effective than other pesticides
B. organisms develop resistance to it
C. productoin cost is very high
D. it has long residual effect

Answer

D

Explanation

DDT is banned because, it shown deleterious effects on organisms and is found in considerably high toxic amount in all trophic level organisms. It is degraded biologically and has long residual effects on almost all living organisms due to the high concentration of accumulation in higher trophic levels, i.e. biomagnification.