The structure which contain vascular bundle and is modification of stem is

Options

A. Prickle
B. Thorn
C. Bristle
D. All the above

Answer

To solve the question, "The structure which contains vascular bundle and is a modification of stem is," we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Vascular Bundles**:
- Vascular bundles are structures in plants that contain xylem and phloem tissues, responsible for the transport of water, minerals, and nutrients.

2. **Analyzing the Options**:
- **Option 1: Prickle**
- Prickles are extensions of the cortex and epidermis.
- They do not contain vascular bundles.
- Therefore, this option is incorrect.

- **Option 2: Thorn**
- Thorns are modified branches or stems.
- They contain vascular bundles, which are essential for the conduction of water and minerals.
- Thorns are derived from the shoot and can be branched or have leaves.
- This option is correct.

- **Option 3: Bristle**
- Bristles are dry, colorless, stiff hairs found on leaves.
- They are extensions of leaf veins and do not contain vascular bundles.
- Therefore, this option is also incorrect.

- **Option 4: All the Above**
- Since only thorns contain vascular bundles and are a modification of stem, this option is incorrect.

3. **Conclusion**:
- The only structure that contains vascular bundles and is a modification of stem is **Option 2: Thorn**.

### Final Answer:
The structure which contains vascular bundle and is a modification of stem is **Thorn**.