I. Unicellular hair
II. Endodermis with passage cells
III. Pith-small / inconspicuous
IV. Radial vascular Bundle
V. Xylem-exarch
VI. 2- 4 xylem and phloem
The above description refers to which of the following

Options

A. Monocot root
B. Dicot root
C. Monocot stem
D. Dicot stem

Answer

To determine what the given descriptions refer to, we will analyze each point step by step.

### Step-by-Step Solution:

1. **Unicellular Hair**:
- Unicellular hairs are typically found on the surface of roots, especially in dicot plants. These hairs help in the absorption of water and nutrients from the soil.

2. **Endodermis with Passage Cells**:
- The endodermis is the innermost layer of the cortex in roots. In dicot roots, it often has passage cells that facilitate the movement of water and nutrients into the vascular system.

3. **Pith - Small/Inconspicuous**:
- In dicot roots, the pith is usually small or may be absent. This is a characteristic feature that distinguishes dicot roots from monocot roots, where the pith is more prominent.

4. **Radial Vascular Bundle**:
- Dicot roots typically have radial vascular bundles, where xylem and phloem are arranged in a radial pattern. This is different from monocots, which usually have scattered vascular bundles.

5. **Xylem - Exarch**:
- In dicot roots, the xylem is exarch, meaning that the protoxylem (the first-formed xylem) is located towards the outside of the xylem cylinder, with metaxylem (later-formed xylem) towards the inside.

6. **2-4 Xylem and Phloem**:
- Dicot roots generally have a specific arrangement of vascular tissues, typically showing 2 to 4 xylem and phloem strands, which is characteristic of dicotyledonous plants.

### Conclusion:
Based on the analysis of the features described, the correct answer is **dicot root**.