Highly thickened wall and very narrow lumen are characteristic features of

Options

A. Sclerenchyma
B. Fibres
C. Collenchyma
D. Parenchyma

Answer

To solve the question regarding which tissue has highly thickened walls and a very narrow lumen, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the tissue type characterized by highly thickened walls and a very narrow lumen.

2. **Identify the Options**: The options provided are:
- Sclerenchyma
- Fibers
- Collenchyma
- Parenchyma

3. **Analyze Each Option**:
- **Sclerenchyma**: This tissue is known for its thick, lignified cell walls. In mature sclerenchyma, the lumen (the inner cavity of the cell) is very small or may even disappear completely.
- **Fibers**: While fibers are a type of sclerenchyma, they do not specifically refer to the characteristic of having a very narrow lumen.
- **Collenchyma**: This tissue has thickened cell walls, but they are not as thick as those in sclerenchyma, and the lumen is not very narrow.
- **Parenchyma**: This tissue typically has thin walls and a larger lumen, which does not match the characteristics given in the question.

4. **Conclusion**: Based on the analysis, the tissue that exhibits highly thickened walls and a very narrow lumen is **Sclerenchyma**.

### Final Answer:
The correct answer is **Sclerenchyma**.

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