After the commencement of secondary growth in dicot stem, the primary xylem would be obseved to occupy a position on the

Options

A. inner side of secondary xylem
B. inner side of secondary phloem
C. outer side of secondary xylem
D. outer side of secondary phloem

Answer

To answer the question regarding the position of primary xylem after the commencement of secondary growth in a dicot stem, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of a Dicot Stem**:
- A dicot stem consists of various tissues including the epidermis, cortex, vascular bundles (which contain xylem and phloem), and pith.

2. **Identify the Role of Primary and Secondary Growth**:
- Primary growth occurs at the tips of roots and stems, leading to an increase in length.
- Secondary growth is responsible for an increase in girth and occurs in the vascular cambium, which produces secondary xylem and phloem.

3. **Examine the Process of Secondary Growth**:
- During secondary growth, the vascular cambium divides to form new layers of xylem (wood) and phloem.
- The secondary xylem is produced towards the inside (center) of the stem, while secondary phloem is produced towards the outside.

4. **Determine the Position of Primary Xylem**:
- The primary xylem is formed during primary growth and is located towards the center of the stem.
- As secondary growth occurs, the new secondary xylem forms inside the primary xylem, pushing the primary xylem outward.

5. **Conclusion**:
- After the commencement of secondary growth in a dicot stem, the primary xylem would be observed to occupy a position on the **outer side of the secondary xylem**.

### Final Answer:
The primary xylem would be observed to occupy a position on the **outer side of the secondary xylem**.

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