in a dorsiventral leaf, protoxylem and metaxlem are located respectively

Options

A. Abaxial and adaxial sides
B. Adaxial and abxial sides
C. Adaxial and adaxial sides
D. Abaxial and abaxial sides

Answer

To answer the question regarding the location of protoxylem and metaxylem in a dorsiventral leaf, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of a Dorsiventral Leaf**:
- A dorsiventral leaf is a type of leaf that has two different surfaces: the upper surface (adaxial) and the lower surface (abaxial). This structure is typical of dicot plants.

2. **Identify the Components of Xylem**:
- Xylem is composed of two main types of cells: protoxylem and metaxylem.
- Protoxylem consists of smaller, immature cells that develop first, while metaxylem consists of larger, more mature cells that develop later.

3. **Locate the Xylem in the Leaf**:
- In a dorsiventral leaf, the xylem is located towards the upper side (adaxial surface) of the leaf, while the phloem is located towards the lower side (abaxial surface).

4. **Determine the Arrangement of Protoxylem and Metaxylem**:
- In the xylem, the protoxylem is positioned closer to the adaxial surface, while the metaxylem is located nearer to the abaxial surface. This arrangement is due to the developmental sequence of these cells.

5. **Conclude the Answer**:
- Therefore, in a dorsiventral leaf, the protoxylem is located at the adaxial surface, and the metaxylem is located at the abaxial surface.

### Final Answer:
- In a dorsiventral leaf, protoxylem is located at the adaxial surface and metaxylem is located at the abaxial surface.

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