A piece of wood having no vessels (trachea) must be belonging to

Options

A. teak
B. mango
C. pine
D. palm.

Explanation

To determine which type of wood has no vessels (tracheids), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Plants**:
- There are two main categories of seed-producing plants: Angiosperms and Gymnosperms.
- Angiosperms are flowering plants that typically have vessels (trachea).
- Gymnosperms are non-flowering plants that usually do not have vessels.

2. **Identify the Characteristics of Vessels**:
- Vessels (or tracheids) are specialized structures in the xylem of plants that facilitate water transport.
- In angiosperms, vessels are present, while in gymnosperms, they are absent.

3. **Analyze the Given Options**:
- The options provided are teak, mango, palm, and pine.
- Teak, mango, and palm are all examples of angiosperms, which means they have vessels.
- Pine, on the other hand, is a gymnosperm.

4. **Conclusion**:
- Since pine is the only option that belongs to the gymnosperms, it is the correct answer as it does not have vessels.

### Final Answer:
A piece of wood having no vessels (trachea) must belong to **pine** (a gymnosperm).

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