A transverse section of a young dicot root can be distinguished from that of a young dicot stem by the presence of :

Options

A. A) radial arrangements of xylem and phloem
B. B) interfascicular cambium
C. C) intrafascicular cambium
D. D) collateral arrangement of xylem and phloem

Explanation

To solve the question of how to distinguish a transverse section of a young dicot root from that of a young dicot stem, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Dicot Roots and Stems**:
- Dicot plants have distinct vascular arrangements in their roots and stems. It's essential to know the basic anatomy of both structures.

2. **Identify the Vascular Tissue Arrangement**:
- In a transverse section of a young dicot root, the vascular bundles (xylem and phloem) are arranged in a radial pattern. This means that the xylem and phloem are located in separate regions, alternating with each other.

3. **Contrast with Dicot Stem Structure**:
- In contrast, the vascular bundles in a young dicot stem are arranged in a ring (collateral arrangement). This means that the xylem and phloem are found adjacent to each other in the same vascular bundle.

4. **Evaluate the Options Given**:
- Option A: Radial arrangement of xylem and phloem (correct for roots).
- Option B: Interfascicular cambium (found in stems).
- Option C: Intrafascicular cambium (found in stems).
- Option D: Collateral arrangement of xylem and phloem (correct for stems).

5. **Select the Correct Answer**:
- The distinguishing feature of a young dicot root compared to a young dicot stem is indeed the radial arrangement of xylem and phloem. Therefore, the correct answer is **Option A**.

### Final Answer:
The transverse section of a young dicot root can be distinguished from that of a young dicot stem by the presence of the **radial arrangement of xylem and phloem** (Option A).

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