In a dorsiventral leaf , protoxylem is situated towards the ( I ) surface and Protophloem towards the ( II ) surface in the vascular bundle.

Options

A. I : adaxidal and II: adaxial
B. I : abaxidal and II: abaxial
C. I : abaxial and II: abaxial
D. I: adaxial and II: abaxial

Answer

To solve the question regarding the positioning of protoxylem and protophloem in a dorsiventral leaf, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of a Dorsiventral Leaf**:
- A dorsiventral leaf has two distinct surfaces: the adaxial (upper) surface and the abaxial (lower) surface. The adaxial side is typically oriented towards the light, while the abaxial side faces away from it.

2. **Identify the Position of Protoxylem**:
- In vascular bundles of a dorsiventral leaf, the protoxylem is located towards the adaxial surface. This is because xylem is responsible for water transport and is positioned to maximize efficiency in light exposure and water absorption.

3. **Identify the Position of Protophloem**:
- Conversely, the protophloem is situated towards the abaxial surface. The phloem is responsible for transporting nutrients, and its position allows for effective distribution of these nutrients throughout the leaf.

4. **Summarize the Findings**:
- Therefore, in a dorsiventral leaf:
- Protoxylem is towards the **adaxial** surface (I).
- Protophloem is towards the **abaxial** surface (II).

5. **Choose the Correct Option**:
- From the analysis, the correct answer is:
- (I) Adaxial
- (II) Abaxial

### Final Answer:
Protoxylem is situated towards the **adaxial** surface and protophloem towards the **abaxial** surface in the vascular bundle.

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