Allochemic juglone is produced by

Options

A. walnut
B. sunflower
C. barley
D. muller.

Answer

**Step-by-Step Solution:**

1. **Understanding Allochemic Juglone**:
- Juglone is a chemical compound that is classified as an allelochemical. Allelochemicals are substances produced by plants that can have an inhibitory effect on the growth of other plants.

2. **Identifying the Source**:
- Juglone is specifically produced by certain plants, primarily those belonging to the family Juglandaceae.

3. **Recognizing the Plant**:
- One of the most well-known plants that produce juglone is the walnut tree. Other plants in the same family may also produce juglone, but walnut is the most commonly referenced.

4. **Examining Other Options**:
- The question provides multiple options: Walnut, Sunflower, Barley, and Muller.
- Sunflower and barley do not produce juglone, as they belong to different families.

5. **Conclusion**:
- Therefore, the correct answer to the question "Allochemic juglone is produced by" is the walnut tree.

**Final Answer**: Juglone is produced by the walnut tree.

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