NEET PG High-Yield: Classification of Insecticides
In NEET PG, questions on insecticides often focus on their chemical structure, mechanism of action, and environmental persistence.
Classification Breakdown
| Class | Key Examples |
|---|---|
| Organochlorines | DDT, HCH (BHC), Lindane, Aldrin, Dieldrin. |
| Organophosphates | Malathion, Fenthion, Parathion, Chlorpyrifos. |
| Carbamates | Propoxur, Carbaryl. |
| Pyrethroids | Permethrin, Cypermethrin, Deltamethrin. |
High-Yield NEET PG Pearls:
- Mechanism: Organophosphates and Carbamates inhibit Acetylcholinesterase (AChE). Note: Organophosphate inhibition is irreversible (aging), while Carbamate inhibition is reversible.
- Persistence: Organochlorines are highly persistent in the environment and bioaccumulate.
- Safety: Pyrethroids are synthetic analogues of pyrethrum; they have low mammalian toxicity and are commonly used in LLINs.
- Usage: Malathion is widely used in fogging operations.