Precursor of cell wall is

Options

A. Middle lamellum
B. Cell plate
C. Mitotic spindle
D. Metaphase plate

Answer

To answer the question "What is the precursor of the cell wall?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Cell Wall**: The cell wall is a rigid outer layer found primarily in plant cells, and it provides structural support and protection. It is mainly composed of cellulose.

2. **Analyze the Options**: The options given are:
- Middle lamellum
- Cell plate
- Mitotic spindle
- Metaphase plate

3. **Evaluate Each Option**:
- **Middle Lamellum**: This is a layer that forms between two plant cells during cell division and is primarily composed of pectins. It acts as a precursor to the cell wall.
- **Cell Plate**: This structure forms during cytokinesis in plant cells and eventually develops into the cell wall, but it is not the precursor itself.
- **Mitotic Spindle**: This is involved in the separation of chromosomes during cell division and does not relate to the cell wall.
- **Metaphase Plate**: This is the alignment of chromosomes during metaphase in cell division and is not related to the formation of the cell wall.

4. **Identify the Correct Answer**: Based on the analysis, the middle lamellum is the precursor to the cell wall, as it is formed first and later develops into the cell wall structure.

5. **Conclusion**: Therefore, the correct answer to the question is the **Middle Lamellum**.