In what respect, the pericycle of a dicot root differs from that of the dicot stem?

Options

A. Option1 Sclerenchymatous in root and collenchymatous in stem
B. Option2 Collenchymatous in root and parenchymatous in stem
C. Option3 Parenchymatous in root and sclerenchymatous in stem
D. Option4 Parenchymatous in root and collenchymatous in stem

Answer

### Step-by-Step Solution:

1. **Definition of Pericycle**:
- The pericycle is a layer of cells in plants that is located just inside the endodermis and surrounds the vascular tissues.

2. **Location in Dicot Root**:
- In dicot roots, the pericycle is situated between the endodermis and the phloem. This positioning is crucial for its function in root growth.

3. **Location in Dicot Stem**:
- In dicot stems, the pericycle is found surrounding the vascular bundles, which are arranged in a ring formation. This location allows it to play a role in the growth of the stem.

4. **Cell Type in Dicot Root**:
- The pericycle in dicot roots is primarily composed of parenchymatous cells. These cells are living, thin-walled, and involved in storage and support.

5. **Cell Type in Dicot Stem**:
- In contrast, the pericycle in dicot stems is made up of sclerenchymatous cells. These cells are typically thicker-walled and provide structural support.

6. **Function in Dicot Root**:
- The pericycle in dicot roots is responsible for generating meristematic cells, which can lead to the formation of secondary roots. This process is essential for the overall growth and stability of the plant.

7. **Function in Dicot Stem**:
- In dicot stems, the pericycle contributes to the formation of vascular cambium, which is responsible for producing new xylem and phloem, facilitating secondary growth and increasing the girth of the stem.

8. **Summary of Differences**:
- To summarize, the main differences between the pericycle of dicot roots and dicot stems are:
- **Location**: Root (between endodermis and phloem) vs. Stem (around vascular bundles).
- **Cell Type**: Parenchymatous in roots vs. Sclerenchymatous in stems.
- **Function**: In roots, it generates meristematic cells for root growth; in stems, it forms vascular cambium for secondary growth.