The oldest layer of sap wood is found just

Options

A. inner to cambium
B. outer to primary xylem
C. outside the heart wood
D. at the periphery of pith

Answer

To answer the question, "The oldest layer of sapwood is found just...", we need to understand the structure of wood in flowering plants, specifically the arrangement of sapwood and heartwood. Here’s a step-by-step breakdown:

### Step-by-Step Solution:

1. **Understand the Structure of Wood**:
- Wood consists of different layers, primarily heartwood and sapwood.
- Heartwood is located at the center of the tree, while sapwood surrounds it.

2. **Identify the Location of Sapwood**:
- Sapwood is found just beneath the bark and above the heartwood.
- It is the layer that is actively involved in the conduction of water and nutrients.

3. **Determine the Age of Sapwood**:
- As trees grow, the inner layers of sapwood can become older. The oldest layer of sapwood is the one that is closest to the heartwood.
- Therefore, the oldest layer of sapwood is found just above the heartwood.

4. **Conclusion**:
- The answer to the question is that the oldest layer of sapwood is found just above the heartwood.

### Final Answer:
The oldest layer of sapwood is found just above the heartwood.