stereome comprises

Options

A. sclerenchyma
B. collenchyma
C. non- living cells of vascular tissue
D. all the above.

Answer

To answer the question "stereome comprises," we need to analyze the options provided and understand what stereome is.

### Step-by-Step Solution:

1. **Understanding Stereome**:
- Stereome is a type of mechanical tissue in plants. It provides structural support and is involved in the mechanical strength of the plant.

2. **Identifying the Components of Stereome**:
- Stereome is primarily made up of three types of tissues:
- **Sclerenchyma**: This is a type of tissue that is characterized by thickened cell walls due to the deposition of lignin. It is a dead tissue and provides rigidity and strength.
- **Collenchyma**: This tissue is composed of living cells and has thickened cell walls, primarily due to the deposition of polysaccharides. It provides flexibility and support to growing parts of the plant.
- **Non-living cells of vascular tissue**: These include the xylem, which is responsible for water transport and also provides structural support.

3. **Reviewing the Options**:
- The options given are:
1. Sclerenchyma
2. Collenchyma
3. Non-living cells of vascular tissue
4. All of the above
- Since stereome comprises all three types of tissues mentioned above, we can conclude that the correct answer is option 4.

4. **Final Answer**:
- Therefore, the correct answer to the question "stereome comprises" is **all of the above**.