Vascular tissue having abundant vessels and fibres is

Options

A. primary xylem
B. Secondary xylem
C. protoxylem
D. Metaxylem

Answer

To answer the question regarding which vascular tissue has abundant vessels and fibers, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Vascular Tissues**:
- Vascular tissues in plants include xylem and phloem. Xylem is responsible for the transport of water and minerals, while phloem transports food.

2. **Identifying Types of Xylem**:
- Xylem can be classified into primary xylem and secondary xylem.
- Primary xylem is formed during the initial stages of plant growth and includes proto-xylem and meta-xylem.

3. **Defining Proto-xylem and Meta-xylem**:
- Proto-xylem is the first xylem to develop and is characterized by smaller vessels and tracheids with fewer pits.
- Meta-xylem develops after proto-xylem and has slightly larger vessels but still does not have a significant amount of fibers.

4. **Understanding Secondary Xylem**:
- Secondary xylem is formed during secondary growth, which occurs when the plant increases in girth.
- It arises from the vascular cambium, a layer of tissue that produces new xylem and phloem.

5. **Characteristics of Secondary Xylem**:
- Secondary xylem contains a larger number of vessels and fibers compared to primary xylem.
- The vessels in secondary xylem are broader and have larger cavities, which facilitate the efficient transport of water and minerals.
- Fibers in secondary xylem have lignified walls, providing structural support to the plant.

6. **Conclusion**:
- Given that secondary xylem is formed during the plant's growth and contains abundant vessels and fibers, the correct answer to the question is **secondary xylem**.

### Final Answer:
The vascular tissue having abundant vessels and fibers is **secondary xylem**.

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