The type of growth shown by primary cell wall is

Options

A. Accretionary
B. Instussuceptionary
C. Protoplasmic
D. None, as it cannot expand or grow

Answer

To determine the type of growth shown by the primary cell wall, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Cell Wall**: The plant cell wall consists of three main layers: the middle lamella, the primary cell wall, and the secondary cell wall.

2. **Identify the Composition of the Middle Lamella**: The middle lamella is primarily composed of calcium and pectin, which acts as a glue to hold the cells together.

3. **Differentiate Between Types of Growth**:
- There are two types of growth that can occur in cell walls:
- **Accretionary Growth**: This type involves the addition of one layer on top of another. It is primarily associated with the secondary cell wall.
- **Interceptionary Growth**: This type involves the deposition of new fibrils, which interweave with the existing ones. This is characteristic of the primary cell wall.

4. **Conclude the Type of Growth for the Primary Cell Wall**: Since the primary cell wall shows interceptionary growth, where new fibrils are added and interwoven with the old ones, we conclude that the primary cell wall exhibits interceptionary growth.

5. **Final Answer**: The type of growth shown by the primary cell wall is **interceptionary growth**.