Which one of the following is least persistent insecticide?

Options

A. Aldrin
B. Dieldrin
C. BHC
D. Carbamates

Answer

To determine which insecticide is the least persistent among the given options (Eldrin, Dieldrin, BHC, and Carbamids), we can analyze each one based on their persistence in the environment.

### Step-by-Step Solution:

1. **Understanding Persistence**:
- Persistence refers to how long a substance remains in the environment without breaking down. Persistent insecticides can accumulate in the ecosystem and cause harm to wildlife and humans.

2. **Analyzing the Options**:
- **Eldrin**: This is a persistent organic pollutant that remains in the environment for a long time. It is used to kill insects in the soil and can have harmful effects on various species.
- **Dieldrin**: Similar to Eldrin, Dieldrin is also a persistent organic pollutant. It is used for both plants and animals and can disturb the environment significantly.
- **BHC (Benzene Hexachloride)**: Known as Lindane, BHC is another persistent organic pollutant. It has applications in agriculture and medicine but is also known for its long-lasting effects in the environment.
- **Carbamids**: These are generally less persistent compared to the other three options. They are used as sprays for insects and tend to break down more quickly in the environment.

3. **Conclusion**:
- Among the four insecticides, **Carbamids** are the least persistent. They do not remain in the environment for extended periods like Eldrin, Dieldrin, and BHC.

### Final Answer:
**Carbamids** are the least persistent insecticide among the options provided.

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