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8.Microbes in Human Welfare
normal
$DDT $ and $2, 4-D$ were Introduced
A
Towards end of World War II
B
Towards beginning of World War II
C
During World War I
D
Just after the World War I
Solution
(a)During the second world war, two synthetic pesticides i.e., $ DDT $ (dichloro diphenyl trichloroethane) and $2, 4-D (2, 4$ dichlorophenoxy acetic acid) were mainly used.
Standard 12
Biology
