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 regarding the cell wall, let's analyze each statement step by step:

### Step 1: Analyze the First Statement
- **Statement**: The function of the middle lamella is to hold different neighboring cells together.
- **Analysis**: This statement is true. The middle lamella is a layer that cements adjacent plant cells together and is primarily composed of pectins, which help in adhesion.

### Step 2: Analyze the Second Statement
- **Statement**: The cell wall is only known to provide shape and protection to the plant cells from infections.
- **Analysis**: This statement is incorrect. While the cell wall does provide shape and protection, it is not solely for protection from infections. It also plays roles in regulating growth and maintaining turgor pressure.

### Step 3: Analyze the Third Statement
- **Statement**: The primary wall disintegrates as the cell matures and the secondary wall is capable of growth.
- **Analysis**: This statement is also incorrect. The primary cell wall is indeed capable of growth, and it does not disintegrate; rather, it can become more rigid as the cell matures. The secondary wall, formed later, is typically not capable of growth.

### Step 4: Analyze the Fourth Statement
- **Statement**: Algal cell wall is made up of cellulose, hemicellulose, pectin, and proteins.
- **Analysis**: This statement is misleading. While algal cell walls can contain cellulose and other components, they may also contain different polysaccharides depending on the type of algae. Therefore, this statement is not universally true.

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

### Final Answer
The true statement regarding the cell wall is: **The function of the middle lamella is to hold different neighboring cells together.**

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