Which of the following are undifferentiated, actively dividing cells?

Options

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

Answer

To solve the question "Which of the following are undifferentiated, actively dividing cells?" we need to analyze the options provided: parenchyma, collenchyma, sclerenchyma, and meristematic tissue.

### Step-by-Step Solution:

1. **Understanding the Types of Tissues**:
- **Parenchyma**: This is a type of ground tissue composed of living cells that are usually thin-walled and unspecialized. They can differentiate into various types of cells and are involved in functions like photosynthesis and storage. However, they are not primarily known for being actively dividing or undifferentiated.

2. **Analyzing Collenchyma**:
- **Collenchyma**: This tissue provides support to the plant and consists of living cells with irregularly thickened walls. While it is living and provides structural support, it is also differentiated and not primarily involved in active division.

3. **Examining Sclerenchyma**:
- **Sclerenchyma**: This is a type of ground tissue that consists of dead cells with thick walls. It provides rigidity and support to the plant. Since these cells are dead and have thickened walls, they are not actively dividing or undifferentiated.

4. **Identifying Meristematic Tissue**:
- **Meristematic Tissue**: This is the key tissue type that consists of undifferentiated, actively dividing cells. These cells are the building blocks for all other types of plant tissues and are characterized by their ability to divide and differentiate into various specialized cells. They have a large nucleus and no intercellular spaces.

5. **Conclusion**:
- Based on the analysis, the correct answer to the question is **meristematic tissue**, as it is the only option that consists of undifferentiated, actively dividing cells.

### Final Answer:
The correct option is **meristematic tissue**.

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