what is presnet just outside the vascular cambium

Options

A. oldest secondary xylem
B. youngest secondary phloem
C. primary phloem
D. youngest secondary xylem

Answer

### Step-by-Step Solution

1. **Understanding the Structure**:
- Begin by visualizing the arrangement of plant tissues. The vascular cambium is a layer of meristematic tissue that is responsible for secondary growth in plants. It is located between the xylem (which transports water) and phloem (which transports nutrients).

2. **Identifying the Layers**:
- In a typical cross-section of a stem, the arrangement from the inside out is as follows:
- **Xylem** (inner layer)
- **Vascular Cambium** (middle layer)
- **Phloem** (outer layer)

3. **Locating the Vascular Cambium**:
- The vascular cambium is situated between the xylem and phloem. To answer the question, we need to identify what is located just outside of this cambium layer.

4. **Analyzing the Options**:
- The options provided include:
- Oldest secondary xylem
- Youngest secondary phloem
- Primary phloem
- Youngest secondary xylem
- We need to determine which of these is located just outside the vascular cambium.

5. **Determining the Correct Answer**:
- The **youngest secondary phloem** is located just outside the vascular cambium. The secondary phloem is produced by the vascular cambium, and as it grows, the outer layers become older.

6. **Conclusion**:
- Therefore, the correct answer to the question "What is present just outside the vascular cambium?" is **youngest secondary phloem**.