Which one is/are the example of modification of stem (s)?

Options

A. Thorns of Bougainvillea
B. Onion
C. Potato
D. All of the above

Answer

To answer the question, "Which one is/are the example of modification of stem(s)?", we will analyze each option provided and determine if it represents a modification of the stem.

### Step-by-Step Solution:

1. **Understanding Stem Modifications**:
- Stems can undergo modifications to adapt to various environmental conditions. These modifications can serve different functions such as storage, protection, or support.

2. **Analyzing the Options**:
- **Option 1: Thorns of Bougainvillea**:
- The thorns of Bougainvillea are indeed modifications of the stem. They serve as a protective mechanism for the plant.
- **Option 2: Onion**:
- The bulb of an onion is a modified stem. It is a fleshy storage organ that helps the plant survive adverse conditions.
- **Option 3: Potato**:
- The potato is a tuber, which is also a modification of the stem. It stores nutrients and can give rise to new plants.
- **Option 4: All of the above**:
- Since all the previous options (thorns of Bougainvillea, onion bulb, and potato tuber) are examples of stem modifications, this option is correct.

3. **Conclusion**:
- All the options provided are examples of modifications of the stem. Therefore, the correct answer is **Option 4: All of the above**.

### Final Answer:
The correct answer is **Option 4: All of the above**.

---