A) carbamates
B) organophosphates
C) pyrethroids
D) marines
Correct Answer: B
Solution :
Chemical or synthetic pesticides are of four types namely: [a] Organochlorines-These are non- biodegradable and persist in soil for long time, eg, DDT, BHC, endrin etc. [b] Organophosphates-These are esters of alcohols with phosphoric acid or with some other acids. These are very toxic acetylcholinesterase inhibitors as a result of which the breakdown of acetylcholine stops, accumulation of acetylcholine resulting in convulsions, paralysis and deaths, eg, malathion, parathion and fenitrothion. [c] Carbamates-They are derived from carbamic acid, eg, carbaryl, dimetilan, aldicarb etc. [d] Pyrethroids-These are synthetic pyrethrin, triazines etc.
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