Secondary xylem and phloem in dicot stem are produced by

Options

A. Axilary meristems
B. Phellogen
C. Vascular Cambium
D. apical meristem

Answer

To answer the question "Secondary xylem and phloem in dicot stem are produced by," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question is asking which tissue is responsible for the production of secondary xylem and phloem in dicot stems.

2. **Identifying the Options**: The options provided are:
- Axillary meristem
- Phallogen
- Vascular cambium
- Apical meristem

3. **Analyzing Each Option**:
- **Axillary Meristem**: This is located at the axil of leaves and is responsible for the growth of lateral branches, not for producing secondary xylem or phloem.
- **Phallogen**: Also known as cork cambium, it is involved in the formation of cork and does not produce secondary xylem or phloem.
- **Vascular Cambium**: This is a lateral meristem located between the xylem and phloem. It is responsible for the production of secondary xylem (wood) and secondary phloem during secondary growth in dicot plants.
- **Apical Meristem**: This is found at the tips of roots and shoots and is responsible for primary growth (elongation) but does not produce secondary xylem or phloem.

4. **Conclusion**: The correct answer is **Vascular cambium**, as it is the tissue responsible for the production of secondary xylem and phloem in dicot stems.

### Final Answer:
**Vascular cambium**

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