Read each of the following statements carefully and choose the one that is true for the cell wall.

Options

A. The function of the middle lamella is to hold different neighouring cells together.
B. The cell wall is only known to provide shape and protection to the plant cell from infections.
C. The primary wall disintegrates as the cell matures and the secondary wall is capable of growth.
D. The algal cell wall is made up of cellulose , hemicellulose, pectins and proteins.

Answer

To determine which statement is true for the cell wall, we will analyze each of the given statements one by one.

### Step-by-Step Solution:

1. **Analyze the First Statement**:
- The statement claims that the function of the middle lamella is to hold different neighboring cells together.
- The middle lamella is indeed a layer that exists between the cell walls of adjacent plant cells, primarily composed of pectins. Its main function is to adhere cells together, providing structural integrity to plant tissues.
- **Conclusion**: This statement is **true**.

2. **Analyze the Second Statement**:
- This statement asserts that the cell wall is only known to provide shape and protection to the plant cell from infections.
- While the cell wall does provide shape and protection, it also has other functions, such as providing tensile strength and maintaining turgor pressure within the cell.
- The use of the word "only" makes this statement misleading.
- **Conclusion**: This statement is **false**.

3. **Analyze the Third Statement**:
- The statement indicates that the primary cell wall disintegrates as the cell matures and that the secondary cell wall is capable of growth.
- It is true that the primary cell wall may disintegrate as the cell matures. However, the secondary cell wall does not grow; it is formed through deposition of materials after the cell has matured.
- **Conclusion**: This statement is **false**.

4. **Analyze the Fourth Statement**:
- This statement claims that the algal cell wall is made up of cellulose, pectins, and proteins.
- While cellulose and pectins are indeed components of algal cell walls, proteins are not typically a component of algal cell walls. Instead, they are primarily composed of carbohydrates.
- **Conclusion**: This statement is **false**.

### Final Conclusion:
After analyzing all the statements, the only true statement regarding the cell wall is the **first statement**: "The function of the middle lamella is to hold different neighboring cells together."