Dead cells with narrow lumen, lignified cell wall with a few or numerous pits and serving a mechanical function only are called -

Options

A. Collenchyma
B. Xylem
C. Aerenchyma
D. Sclerenchyma

Answer

To answer the question regarding dead cells with narrow lumen, lignified cell walls, and serving a mechanical function, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Characteristics**: The question describes cells that are dead, have a narrow lumen, and possess lignified cell walls. These characteristics are crucial in identifying the type of cells being referred to.

2. **Understand the Function**: The cells mentioned serve a mechanical function. This indicates that they provide support and strength to the plant structure.

3. **Consider the Options**: The options provided are colon chima, xylem, arene chima, and escalane chima. We need to evaluate which of these fits the description.

4. **Evaluate Each Option**:
- **Colon Chima**: This term does not correspond to any known plant tissue type.
- **Xylem**: This is a type of tissue in vascular plants that is responsible for the transport of water and minerals. It consists of both living and dead cells, but it is primarily involved in transport rather than just mechanical support.
- **Arene Chima**: This is a type of parenchyma and does not fit the description of dead cells serving a mechanical function.
- **Escalane Chima**: This term is not widely recognized in botanical terminology.

5. **Conclusion**: Based on the analysis, the correct answer is **xylem**, specifically referring to the tracheids or fibers within the xylem that are dead at maturity, have narrow lumens, lignified walls, and serve a mechanical function.

### Final Answer:
Dead cells with narrow lumen, lignified cell wall, and serving a mechanical function only are called **xylem**.

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