A natural insecticide obtained from plants is

Options

A. Azadirachtin
B. Rotenone
C. Nicotine, pyrethrum and cinerin
D. All the above

Answer

To answer the question "A natural insecticide obtained from plants is," we need to evaluate the options provided and determine which of them are indeed natural insecticides derived from plants.

### Step-by-Step Solution:

1. **Understanding the Question**: We need to identify natural insecticides that are obtained from plants. The options provided are azadirachtin, rotenone, nicotine, pyrethrum, and stenerin, along with the option "all of the above."

2. **Analyzing Azadirachtin**:
- Azadirachtin is an extract derived from the seeds of the neem tree (Azadirachta indica).
- It acts as a natural insect growth regulator and is widely used in agriculture.
- **Conclusion**: Azadirachtin is a natural insecticide.

3. **Analyzing Rotenone**:
- Rotenone is a colorless, odorless crystalline isoflavone.
- It is used as a broad-spectrum insecticide and is found in the roots and stems of several plants, particularly in the Fabaceae family.
- **Conclusion**: Rotenone is also a natural insecticide.

4. **Analyzing Nicotine**:
- Nicotine is a well-known alkaloid that occurs naturally in tobacco plants.
- It has insecticidal properties and can be used to control pests.
- **Conclusion**: Nicotine is a natural insecticide.

5. **Analyzing Pyrethrum**:
- Pyrethrum is derived from the flowers of the chrysanthemum plant.
- It acts as a direct contact insecticide and is effective against a wide range of insects.
- **Conclusion**: Pyrethrum is a natural insecticide.

6. **Analyzing Stenerin**:
- Stenerin is less commonly known but is also derived from plant sources and has insecticidal properties.
- **Conclusion**: Stenerin is a natural insecticide.

7. **Final Conclusion**:
- Since all the options listed (azadirachtin, rotenone, nicotine, pyrethrum, and stenerin) are natural insecticides obtained from plants, the correct answer is "all of the above."

### Answer:
The correct option is **all of the above** (option 4).

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