The wood of Pinus is

Options

A. Manoxylic and homoxylous
B. Manoxylic and heteroxylous
C. Pycnoxylic and homoxylous
D. Pycnoxylic and heteroxylous.

Answer

To answer the question "The wood of Pinus is," we will analyze the characteristics of Pinus wood and categorize it based on the types of wood present in plants.

### Step-by-Step Solution:

1. **Identify the Type of Plant**:
- Pinus is a genus of trees commonly known as pines, which belong to the group of plants known as gymnosperms.

2. **Understand Wood Types**:
- There are two main types of wood:
- **Pycnoxylic Wood**: This is compact, strong wood that contains a large amount of xylem tracheids. It is typical of gymnosperms.
- **Monoxylic Wood**: This is non-compact wood that has a large amount of parenchyma and less xylem tracheids. It is generally found in angiosperms.

3. **Characteristics of Pycnoxylic Wood**:
- Pycnoxylic wood is characterized by:
- High density and strength.
- Significant secondary growth due to the large amount of xylem tracheids.
- Small amounts of cortex and pith.

4. **Pinus Wood Analysis**:
- Since Pinus is a gymnosperm, it is expected to have pycnoxylic wood. This wood is strong and durable, making it suitable for construction and other commercial uses.

5. **Eliminate Incorrect Options**:
- Based on the definitions:
- **Homoxylous Wood**: Non-porous wood found in gymnosperms, but not specifically applicable to Pinus.
- **Heteroxylous Wood**: Found in angiosperms, thus not applicable to Pinus.

6. **Conclusion**:
- Therefore, the wood of Pinus is classified as **pycnoxylic wood**.

### Final Answer:
The wood of Pinus is **pycnoxylic wood**.