Centrifugal development of xylem is

Options

A. Stem
B. Root
C. Lateral root
D. None of these

Answer

### Step-by-Step Solution:

1. **Understanding Xylem**:
- Xylem is a type of vascular tissue in plants responsible for the conduction of water and minerals from the roots to the leaves. It is characterized as a unidirectional tissue, meaning it only transports substances in one direction (upwards).

**Hint**: Recall that xylem is primarily involved in water transport in plants.

2. **Defining Centrifugal Development**:
- Centrifugal development refers to the arrangement of xylem elements where protoxylem is located towards the center (near the pith) and metaxylem is found at the periphery. This arrangement is crucial for the proper functioning of the xylem.

**Hint**: Remember the arrangement: protoxylem is central, metaxylem is peripheral.

3. **Identifying the Type of Development**:
- The arrangement described (protoxylem in the center and metaxylem at the periphery) is specifically known as centrifugal development. This type of development is also referred to as "andark development."

**Hint**: Note that "andark development" is another term for centrifugal development.

4. **Determining Where Centrifugal Development Occurs**:
- Centrifugal development is typically found in the stems of plants. In contrast, roots do not exhibit this type of development; they have a different arrangement of xylem.

**Hint**: Focus on the parts of the plant where this arrangement is found; stems are key.

5. **Evaluating the Options**:
- Given the options, the correct answer is the stem, as it is the part of the plant where centrifugal development of xylem occurs. Other options such as roots or lateral roots do not exhibit this arrangement.

**Hint**: Eliminate options that do not match the characteristics of centrifugal development.

### Final Answer:
The correct answer is **Option A: Stem**.