Monocot root differs from dicot root in having

Options

A. More than six xylem bundles
B. Pericycle
C. Endodermis
D. Showing secondary growth

Answer

To answer the question regarding how monocot roots differ from dicot roots, we will analyze the structural differences between the two types of roots.

### Step-by-Step Solution:

1. **Vascular Bundle Arrangement**:
- In dicot roots, the vascular bundles are arranged in a **diarch** pattern. This means there are two xylem poles.
- In monocot roots, the vascular bundles are arranged in a **polyarch** pattern, which means there are multiple xylem poles.

**Hint**: Remember that "diarch" refers to two and "polyarch" refers to many.

2. **Pith Size**:
- The pith in dicot roots is usually **small**.
- In monocot roots, the pith is **relatively large**.

**Hint**: Think about the space available in the center of the root; monocots have more room.

3. **Cortex and Chenileum**:
- In dicot roots, the **chenileum** (conjunctive tissue) can become **meristematic**, allowing for secondary growth.
- In monocot roots, the **chenileum** does not become meristematic, which means there is no secondary growth.

**Hint**: Secondary growth is crucial for thickening; consider which type of root can grow thicker over time.

4. **Pericycle Function**:
- In dicot roots, the pericycle can give rise to **cork** and lateral branches.
- In monocot roots, the pericycle primarily gives rise to **only lateral branches**.

**Hint**: Think about the additional structures that can develop from the pericycle in dicots.

5. **Secondary Growth**:
- Dicot roots exhibit **secondary growth**, which allows them to increase in thickness over time.
- Monocot roots typically do **not** show secondary growth.

**Hint**: Secondary growth is a key feature of dicots; consider how this affects the overall structure of the plant.

### Conclusion:
Monocot roots differ from dicot roots primarily in their vascular bundle arrangement (polyarch vs. diarch), the size of the pith (large vs. small), the behavior of the chenileum (no secondary growth vs. meristematic), the function of the pericycle (only lateral branches vs. cork and lateral branches), and the presence of secondary growth (absent in monocots).

### Final Answer:
Monocot roots differ from dicot roots in having a polyarch arrangement of vascular bundles, a larger pith, a non-meristematic chenileum, and the absence of secondary growth.