Which one of the following type of simple tissue is present below epidermis, in dicotyledonous stems either as a homogenous layer or in patches, whose cell walls are much thickened often at the corners due to deposition of cellulose, hemicellulose and pectin ?

Options

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

Answer

To solve the question regarding the type of simple tissue present below the epidermis in dicotyledonous stems, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for a type of simple tissue located beneath the epidermis in dicotyledonous stems, characterized by thickened cell walls at the corners due to the deposition of cellulose, hemicellulose, and pectin.

2. **Identify Simple Tissues**: Simple tissues are composed of only one type of cell. In plants, the main types of simple tissues include parenchyma, collenchyma, and sclerenchyma.

3. **Analyze the Characteristics**:
- The tissue is located below the epidermis.
- It can be found as a homogeneous layer or in patches.
- The cell walls are much thickened, particularly at the corners.
- The thickening is due to the deposition of cellulose, hemicellulose, and pectin.

4. **Evaluate Each Type of Simple Tissue**:
- **Parenchyma**: This tissue is generally not characterized by thickened cell walls. It is more involved in storage and photosynthesis.
- **Collenchyma**: This tissue is known for its thickened corners and is primarily responsible for providing support to young stems and petioles. It fits the description given in the question.
- **Sclerenchyma**: This tissue has thickened walls due to lignin deposition, which makes it dead at maturity, and it is not typically found just below the epidermis.
- **Chlorenchyma**: This is a type of parenchyma that contains chloroplasts and is involved in photosynthesis, not relevant to the question.

5. **Conclusion**: Based on the analysis, the tissue that meets all the criteria described in the question is **collenchyma**. Therefore, the correct answer is option number 3: **collenchyma**.