In which structure peripheral vascular bundles are generally smaller than centrally located ones ?

Options

A. Dicot stem
B. Monocot stem
C. Dicot root
D. Monocot root

Answer

To answer the question about which structure has peripheral vascular bundles that are generally smaller than centrally located ones, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Vascular Bundles**: Vascular bundles are the part of the plant's vascular system, consisting of xylem and phloem. They are responsible for the transport of water, nutrients, and food.

2. **Identifying Plant Structures**: The question provides four options:
- Dicot stem
- Monocot stem
- Dicot root
- Monocot root

3. **Analyzing Dicot Stem**: In a dicot stem, vascular bundles are arranged in a circular pattern. The vascular bundles are typically larger in the center and smaller towards the periphery.

4. **Analyzing Monocot Stem**: In a monocot stem, vascular bundles are scattered throughout the ground tissue. They do not have a clear central versus peripheral distinction, as they are not arranged in a circular pattern.

5. **Analyzing Dicot Root**: In a dicot root, vascular bundles are also arranged in a central core with a larger central vascular bundle and smaller peripheral bundles.

6. **Analyzing Monocot Root**: In a monocot root, the vascular bundles are arranged in a ring, but they do not follow the pattern of having smaller peripheral bundles compared to the central ones.

7. **Conclusion**: The structure where peripheral vascular bundles are generally smaller than centrally located ones is the **dicot stem**. However, the monocot stem also has a similar arrangement where peripheral bundles can appear smaller due to their scattered nature.

8. **Final Answer**: The correct answer is **Monocot Stem**.