Rotenone ,a natural insecticide ,is obtained from

Options

A. Azadirachta indica
B. Derris sp.
C. Bacillus thuringiensis
D. Phytophthora palmivora

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about Rotenone, a natural insecticide, and from which source it is obtained.

2. **Identifying the Options**: The options provided are:
- A) Azadirachta indica
- B) Derris species
- C) Bacillus thuringiensis
- D) Phytophthora palmivora

3. **Analyzing Each Option**:
- **A) Azadirachta indica**: This is the scientific name for the neem tree, known for its insecticidal properties, but it does not produce Rotenone.
- **B) Derris species**: This is a genus of plants from which Rotenone is extracted. It belongs to the family Fabaceae and is known for its use as a natural insecticide.
- **C) Bacillus thuringiensis**: This is a bacterium used as a biological pesticide but does not produce Rotenone.
- **D) Phytophthora palmivora**: This is a fungus used as a mycoherbicide and does not produce Rotenone.

4. **Conclusion**: Based on the analysis, the correct answer is **B) Derris species**, as Rotenone is primarily obtained from the roots of plants in this genus.

5. **Final Answer**: Rotenone, a natural insecticide, is obtained from **Derris species**.

---