In conifers fibres are likely to be absent in

Options

A. secondary phloem
B. secondary xylem
C. prmary phloem
D. leaves

Explanation

To solve the question "In conifers, fibers are likely to be absent in:", we will analyze the options provided and understand the structure and composition of conifers.

### Step-by-Step Solution:

1. **Understand the Structure of Conifers**:
- Conifers are a group of gymnosperms that are characterized by their cone-bearing reproductive structures and vascular tissues.

2. **Identify the Types of Tissues**:
- Conifers have different types of tissues including primary phloem, secondary phloem, secondary xylem, and leaves. Each of these tissues has specific functions and characteristics.

3. **Examine the Secondary Xylem**:
- In gymnosperms like conifers, the secondary xylem is generally simpler and more homogeneous compared to that of angiosperms.
- Notably, conifers lack vessel elements, which are typically found in angiosperms.

4. **Role of Fibers**:
- Fibers are a type of sclerenchyma cell that provides mechanical support. They are usually present in various plant tissues to enhance strength.

5. **Determine Where Fibers are Absent**:
- In conifers, fibers are typically absent in the secondary xylem. This is a distinguishing feature of coniferous wood, which is primarily composed of tracheids and parenchyma rather than fibers.

6. **Evaluate Other Options**:
- **Secondary Phloem**: Fibers can be present in the secondary phloem of some plants, including conifers.
- **Primary Phloem**: This tissue may also contain fibers in some species.
- **Leaves**: Leaves may contain fibers, but they are not the primary tissue type.

7. **Conclusion**:
- Based on the analysis, the correct answer is that fibers are likely to be absent in the **secondary xylem** of conifers.

### Final Answer:
Fibers are likely to be absent in **secondary xylem**.

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