Select an incorrect statement regarding apical meristem

Options

A. Composed of a small mass of cells which are alike and constitute the promeristem
B. Clear demarcation in the outer layers (tunica) and the inner mass (corpus)
C. The cells of the promeristem differentiate into three regions viz. dermatogen, periblem and plerome
D. Dermatogen, periblem and plerome grow and give rise to secondary permanent tissues.

Explanation

To determine the incorrect statement regarding apical meristem, we will analyze the characteristics and functions of apical meristem step by step.

### Step-by-Step Solution:

1. **Understanding Meristem**:
- Meristem is a region in plants where active cell division occurs. This is crucial for plant growth.

2. **Types of Meristem**:
- Meristems are primarily categorized into three types: apical meristem, lateral meristem, and intercalary meristem. Here, we focus on apical meristem.

3. **Location of Apical Meristem**:
- Apical meristem is located at the tips of roots and shoots. This positioning allows for the elongation of these structures.

4. **Function of Apical Meristem**:
- The primary function of apical meristem is to produce primary tissues. These tissues contribute to the growth of the plant in length.

5. **Structure of Apical Meristem**:
- Apical meristem consists of a small mass of cells that are similar in structure, known as promeristem.
- It is divided into two layers: the outer layer called tunica and the inner layer called corpus.

6. **Differentiation of Promeristem**:
- The cells of the promeristem differentiate into three regions:
- Dermatogen (which gives rise to the epidermis),
- Parablast (which contributes to the ground tissue),
- Plurome (which forms the vascular tissue).

7. **Incorrect Statement Identification**:
- The statement that apical meristem gives rise to secondary permanent tissue is incorrect. Apical meristem is responsible for the formation of primary tissues, not secondary tissues.

### Conclusion:
The incorrect statement regarding apical meristem is that it produces secondary permanent tissue. Apical meristem specifically produces primary tissue.