The fatty chemical substance in cork cell wall is

Options

A. lignin
B. chitin
C. cutin
D. suberin

Answer

To answer the question about the fatty chemical substance in cork cell walls, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Context**:
- Cork cells are found in the bark of trees and serve to protect the plant from the external environment. They also help maintain the internal environment of the plant.

2. **Identify the Nature of Cork Cells**:
- Cork cells are dead tissues that arise from the differentiation of cells in the cambium layer of the plant.

3. **Analyze the Options**:
- The options provided are:
- A) Lignin
- B) Chitin
- C) Cutin
- D) Suberin

4. **Evaluate Each Option**:
- **Lignin**: This is a polymer found in the cell walls of plants, but it is not the fatty substance in cork cells.
- **Chitin**: This is found in the cell walls of fungi and the exoskeletons of arthropods, not in cork cells.
- **Cutin**: This is present in the cuticle of plants but is not the primary component of cork cell walls.
- **Suberin**: This is a fatty substance found in the cell walls of cork cells and is responsible for making them impermeable to water.

5. **Select the Correct Answer**:
- Based on the evaluation, the correct answer is **Suberin (Option D)**, as it is the fatty chemical substance present in the cork cell wall.

### Final Answer:
The fatty chemical substance in cork cell walls is **Suberin**.