The feature which is common to both heartwood and sapwood is

Options

A. Both are the regions of secondary xylem
B. Both are involved in the conduction of water
C. Both comprise dead elements with accumulation of aromatic compounds
D. Both are located in the central layers of the stem.

Answer

To answer the question regarding the common feature of both heartwood and sapwood, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definitions**:
- **Heartwood**: This is the inner part of a tree trunk, which is typically darker in color and consists of non-living xylem. It is formed from older layers of secondary xylem and is not involved in water conduction.
- **Sapwood**: This is the outer part of the trunk, lighter in color, and consists of living xylem. It is actively involved in water conduction and nutrient transport.

2. **Identify the Location**:
- Heartwood is located at the center of the tree trunk, while sapwood surrounds it. They are arranged in alternating layers within the trunk.

3. **Examine the Functions**:
- Heartwood primarily provides structural support and does not conduct water.
- Sapwood is responsible for the conduction of water and nutrients from the roots to the leaves.

4. **Determine the Common Feature**:
- Despite their differences in function and location, both heartwood and sapwood are composed of **secondary xylem**. This is the key feature that is common to both.

5. **Conclusion**:
- Therefore, the common feature between heartwood and sapwood is that **both are regions of secondary xylem**.

### Final Answer:
The feature which is common to both heartwood and sapwood is that **both are regions of secondary xylem**.

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