Iedntify the tissue in which cells are much thickened at the corners due to a deposition of cellulose, hemicellulose and pectin :-

Options

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

Answer

To identify the tissue in which cells are much thickened at the corners due to a deposition of cellulose, hemicellulose, and pectin, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Plant Tissues**:
- Plant tissues are generally categorized into two main types: meristematic and permanent tissues. Permanent tissues can be further divided into simple and complex tissues.

2. **Identify the Options Given**:
- The options provided are:
1. Parenchyma
2. Collenchyma
3. Sclerenchyma
4. Ortho (this option seems incomplete or unclear)

3. **Analyze Each Tissue Type**:
- **Parenchyma**: This is a type of simple permanent tissue characterized by thin-walled cells. The cell walls are primarily composed of cellulose, and they do not have significant thickening at the corners.
- **Collenchyma**: This tissue is known for its thickened cell walls at the corners. The thickening is due to the deposition of cellulose, hemicellulose, and pectin. It provides mechanical support, especially in young stems and petioles of dicot plants.
- **Sclerenchyma**: This tissue is composed of thick-walled cells that provide strength and support. However, the thickening is primarily due to lignin, not cellulose and pectin.
- **Ortho**: This option is unclear and does not correspond to a known type of plant tissue.

4. **Determine the Correct Answer**:
- Based on the analysis, the tissue that has cells much thickened at the corners due to the deposition of cellulose, hemicellulose, and pectin is **Collenchyma**.

### Final Answer:
The correct answer is **Collenchyma** (Option 2).

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