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 specific type of simple tissue found below the epidermis in dicotyledonous stems. It describes the tissue as having thickened cell walls at the corners due to the deposition of cellulose, hemicellulose, and pectin.

2. **Identify Key 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.

3. **Evaluate the Options**:
- **Parenchyma**: This is a type of simple tissue that is generally not characterized by thickened walls. It is involved in storage and photosynthesis.
- **Sclerenchyma**: This tissue is composed of dead cells with very thick walls, but it primarily provides structural support and is not typically found just below the epidermis in the manner described.
- **Collenchyma**: This tissue is characterized by living cells with unevenly thickened walls, particularly at the corners. It provides flexible support to the plant and is often found just below the epidermis in stems and petioles of dicots.
- **Prosenchyma**: This term is not commonly used in the context of simple tissues in flowering plants and is not relevant here.

4. **Select the Correct Answer**: Based on the characteristics and the evaluation of the options, the correct answer is **Collenchyma**. It fits the description of being located below the epidermis and having thickened cell walls due to cellulose, hemicellulose, and pectin.

### Final Answer:
The type of simple tissue present below the epidermis in dicotyledonous stems, characterized by thickened cell walls at the corners, is **Collenchyma**.

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