Which of the following cells have thickened corners due to pectin?

Options

A. parenchyma
B. collenchyma
C. sclerenchyma
D. cork

Answer

To answer the question "Which of the following cells have thickened corners due to pectin?", we can analyze the different types of plant cells mentioned in the video transcript. Here’s a step-by-step breakdown:

### Step 1: Understand the Types of Cells
- **Parenchyma**: These are thin-walled living cells. The thickening in parenchyma is primarily due to cellulose, not pectin.

### Step 2: Analyze Polyenchyma
- **Polyenchyma**: This type of cell contains elongated living cells and is known for its mechanical support in young plants, especially in dicot stems. The thickening in polyenchyma is specifically due to pectin, which is the focus of the question.

### Step 3: Examine Sclerenchyma
- **Sclerenchyma**: This tissue consists of dead cells and serves a mechanical function. The thickening in sclerenchyma is due to lignin, not pectin.

### Step 4: Look at Cork
- **Cork**: Cork cells are non-living and their thickening is primarily due to suberin, which is also not related to pectin.

### Conclusion
Based on the analysis of the different types of cells, the answer to the question is that **polyenchyma cells have thickened corners due to pectin**.

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