What does OP stand for in the context of pesticides?

What does OP stand for in the context of pesticides?

• A. Organochlorines
• B. Organophosphates
• C. Carbamates
• D. Pyrethroids

Answer: (B)

OP stands for organophosphates, a class of pesticides that are phosphorus-containing esters used mainly as insecticides. They’re grouped together because they share a common mechanism: they inhibit acetylcholinesterase, the enzyme that breaks down acetylcholine in the nervous system. When this enzyme is blocked, acetylcholine builds up, causing excessive nerve firing that can be toxic to both insects and humans with sufficient exposure. Examples include malathion, parathion, and chlorpyrifos. This class is distinct from organochlorines (chlorinated hydrocarbons like DDT), carbamates (another acetylcholinesterase inhibitor but with a different chemical structure), and pyrethroids (which target sodium channels).

OP stands for organophosphates, a class of pesticides that are phosphorus-containing esters used mainly as insecticides. They’re grouped together because they share a common mechanism: they inhibit acetylcholinesterase, the enzyme that breaks down acetylcholine in the nervous system. When this enzyme is blocked, acetylcholine builds up, causing excessive nerve firing that can be toxic to both insects and humans with sufficient exposure. Examples include malathion, parathion, and chlorpyrifos. This class is distinct from organochlorines (chlorinated hydrocarbons like DDT), carbamates (another acetylcholinesterase inhibitor but with a different chemical structure), and pyrethroids (which target sodium channels).