Which of the following is a stem?

Options

A. Turnip
B. Onion
C. Radish
D. Carrot

Answer

To determine which of the following options is a stem, we need to analyze each option provided: Turnip, Onion, Radish, and Carrot.

### Step-by-Step Solution:

1. **Understand the Definitions**:
- A stem is a part of the plant that supports leaves, flowers, and fruits. It is usually above ground and can be modified for various functions.
- Roots are the parts of the plant that anchor it in the soil and absorb water and nutrients.

2. **Analyze Each Option**:
- **Turnip**: This is a root vegetable. It is the swollen taproot of the plant and is primarily involved in storage.
- **Onion**: This is a bulb, which is a modified stem. It stores nutrients and can produce new shoots.
- **Radish**: Similar to turnip, radish is also a root vegetable. It is primarily a storage root.
- **Carrot**: This is another root vegetable. It is a taproot that stores energy.

3. **Identify the Stem**:
- From the analysis, the only option that qualifies as a stem is **Onion**, as it is a modified stem (bulb).

4. **Conclusion**:
- Therefore, the correct answer to the question "Which of the following is a stem?" is **Onion**.