Which one is not an example of tap root?

Options

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

Answer

To determine which of the following options is not an example of a taproot, we need to understand what a taproot is and identify the root types of the given plants.

### Step-by-Step Solution:

1. **Define Taproot**: A taproot is a primary root that grows vertically downward and is thicker than the other roots. It serves as the main root from which smaller lateral roots branch out.

2. **Identify the Options**: The options given are:
- A. Carrot
- B. Radish
- C. Turnip
- D. Onion

3. **Analyze Each Option**:
- **Carrot**: Carrots are known to have a taproot system. The main carrot root grows deep into the soil, making it a classic example of a taproot.
- **Radish**: Radishes also have a taproot structure. The main radish root grows downward, and it is thick and fleshy.
- **Turnip**: Turnips are another example of a taproot. They grow deep into the soil and have a thick, fleshy root.
- **Onion**: Onions do not have a taproot. Instead, they have a fibrous root system. The bulb of the onion is actually a modified stem, and the roots that grow from it are not classified as taproots.

4. **Conclusion**: Based on the analysis, the plant that is not an example of a taproot is **D. Onion**.

### Final Answer:
**D. Onion**