Highly rigid cell wall in the following is

Options

A. Suberised wall
B. Lignified wall
C. Cutinised wall
D. Primary cellwall

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which type of cell wall is highly rigid among the given options: subarised wall, lignified wall, cutinised wall, and primary cell wall.

2. **Identifying Key Characteristics**: To determine which wall is highly rigid, we need to understand the composition and function of each type of wall mentioned in the options.

3. **Analyzing Each Option**:
- **Subarised Wall**: This wall contains suberin, which provides some rigidity but is primarily involved in waterproofing.
- **Lignified Wall**: This wall contains lignin, a complex polymer that provides significant rigidity and strength. It is found in structures that require support and transport, such as sclerenchyma, xylem vessels, and tracheids.
- **Cutinised Wall**: This wall contains cutin, which is primarily involved in preventing water loss and does not contribute significantly to rigidity.
- **Primary Cell Wall**: This wall is flexible and primarily composed of cellulose, hemicellulose, and pectin, which allows for growth and expansion of the cell.

4. **Conclusion**: Among the options, the lignified wall is the one that provides the highest rigidity due to the presence of lignin. Therefore, the answer to the question is the **lignified wall**.

### Final Answer:
The highly rigid cell wall is the **lignified wall**.

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