Which of the following provide maximum mechanical strength to a tree trunk .

Options

A. Heart wood
B. Sap wood
C. Cork
D. Late wood

Answer

**Step-by-Step Solution:**

1. **Understanding the Options**: The question asks which part of a tree trunk provides maximum mechanical strength. The options given are hardwood, sapwood, cork, and late wood.

2. **Defining Hardwood**: Hardwood is the dense, strong wood that comes from deciduous trees. It is also known as "duraman." Hardwood is primarily found in the central part of the tree trunk and is composed of dead cells.

3. **Characteristics of Hardwood**: Hardwood contains tannins and other substances that contribute to its darker color and aromatic properties. It is known for its mechanical strength and resistance to decay.

4. **Comparing Other Options**:
- **Sapwood**: This is the younger, outer part of the wood that is responsible for the transport of water and nutrients. It is not as strong as hardwood.
- **Cork**: This is the outer protective layer of the tree and does not contribute significantly to the mechanical strength of the trunk.
- **Late Wood**: Also known as autumn wood, it forms in the late growing season and is generally denser than early wood but still does not provide as much strength as hardwood.

5. **Conclusion**: Based on the characteristics and functions of each type of wood, hardwood provides the maximum mechanical strength to a tree trunk compared to sapwood, cork, and late wood.

6. **Final Answer**: The correct answer is **hardwood**.

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