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Social & Preventive Medicine General ff2cb1f3

The following statement about DDT is false:

A
Pyrethrum has synergistic action
B
It is a contact poison
C
Immediately kills the prey
D
Residual effect lasts for 18 months
High-Yield Explanation
Immediately kills the prey Repeat from May 11 DDT does not immediately kill the insects. It takes several hours to kill them.

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