Position of xylem & phloem in leaf respectively -

Options

A. Abaxial & Adaxial
B. Adaxial & Abaxial
C. Both adaxial
D. Both abaxial

Answer

To determine the position of xylem and phloem in a leaf, we need to understand the anatomy of the leaf and the definitions of the terms involved.

### Step-by-Step Solution:

1. **Understanding Leaf Structure**:
- A leaf consists of different layers, including the upper epidermis (adaxial surface) and the lower epidermis (abaxial surface). The vascular bundles, which contain xylem and phloem, are embedded within the leaf tissue.

2. **Defining Adaxial and Abaxial**:
- The term "adaxial" refers to the upper side of the leaf, while "abaxial" refers to the lower side of the leaf. This distinction is crucial for identifying the positions of xylem and phloem.

3. **Identifying Vascular Bundles**:
- In the vascular bundles of the leaf, xylem and phloem are located together. The xylem is responsible for transporting water and minerals from the roots to the leaves, while the phloem transports food produced by photosynthesis.

4. **Position of Xylem and Phloem**:
- In most dicotyledonous plants, the xylem is positioned on the adaxial side (the upper side) of the vascular bundle, and the phloem is located on the abaxial side (the lower side).

5. **Conclusion**:
- Therefore, the correct answer to the question regarding the position of xylem and phloem in a leaf is that xylem is located on the adaxial side and phloem is located on the abaxial side.

### Final Answer:
The position of xylem and phloem in a leaf respectively is: **Xylem - Adaxial, Phloem - Abaxial**.