Fibres are likely to be absent in

Options

A. secondary phloem
B. secondary Xylem
C. primary phloem
D. leaves

Explanation

To determine where fibers are likely to be absent in plants, we need to analyze the different types of vascular tissues: secondary phloem, secondary xylem, primary phloem, and leaves.

### Step-by-Step Solution:

1. **Understanding Vascular Tissues**:
- Vascular tissues in plants include xylem and phloem.
- Xylem is responsible for transporting water and minerals from roots to aerial parts, while phloem transports food (sucrose) throughout the plant.

2. **Components of Xylem**:
- Xylem consists of tracheids, vessels, xylem parenchyma, and sclerenchyma, which includes xylem fibers.
- Therefore, xylem contains fibers.

3. **Components of Phloem**:
- Phloem is made up of sieve tubes, companion cells, phloem parenchyma, and phloem fibers.
- Thus, phloem also contains fibers.

4. **Primary Phloem**:
- Primary phloem is formed from the apical meristem and consists of living tissue.
- It includes proto-phloem and meta-phloem but typically does not have fibers.

5. **Secondary Phloem**:
- Secondary phloem is formed later in the plant's life and does contain fibers, as it develops from the cambium layer.

6. **Leaves**:
- Leaves contain vascular bundles that include both xylem and phloem, which means they also contain fibers.

7. **Conclusion**:
- Since primary phloem is the only option that does not contain fibers, the answer is that fibers are likely to be absent in **primary phloem**.

### Final Answer:
Fibers are likely to be absent in **primary phloem**.