Which simple permanent tissue provides mechanical support to the growing parts of plant such as young stem and petiole of a leaf.

Answer

To answer the question about which simple permanent tissue provides mechanical support to the growing parts of the plant, such as the young stem and petiole of a leaf, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Type of Tissue**: We need to determine which simple permanent tissue is responsible for providing mechanical support in plants. The options typically include parenchyma, collenchyma, and sclerenchyma.

2. **Understand the Function of the Tissues**:
- **Parenchyma**: This tissue is primarily involved in storage, photosynthesis, and tissue repair. It does not provide significant mechanical support.
- **Sclerenchyma**: This tissue provides rigidity and strength but is usually found in mature parts of the plant and is composed of dead cells.
- **Collenchyma**: This tissue is characterized by living cells that provide flexible support, especially in young, growing parts of the plant.

3. **Focus on Mechanical Support**: The question specifically asks for a tissue that supports growing parts. Collenchyma is known for its ability to provide mechanical support while allowing for growth and flexibility.

4. **Characteristics of Collenchyma**:
- Collenchyma cells have irregularly thickened cell walls, which are rich in cellulose, hemicellulose, and pectin.
- These thickened corners of the cells help in providing structural support to the young stem and petiole of leaves.

5. **Conclusion**: Based on the characteristics and functions of the tissues, the simple permanent tissue that provides mechanical support to the growing parts of the plant, such as the young stem and petiole of a leaf, is **collenchyma**.

### Final Answer:
The simple permanent tissue that provides mechanical support to the growing parts of the plant, such as the young stem and petiole of a leaf, is **collenchyma**.

---