Root apex is subterminal because it is -

Options

A. Covered with root hair
B. Covered with root cap
C. Covered with epidermis
D. Under the soil

Answer

To understand why the root apex is considered sub-terminal, we can break down the explanation into the following steps:

### Step-by-Step Solution:

1. **Definition of Sub-terminal**:
- The term "sub-terminal" refers to a position that is not at the very end or tip (terminal) but is located just below it. In the context of the root, it indicates that the apex is situated just beneath the terminal point.

2. **Structure of the Root Apex**:
- The root apex is the growing tip of the root, where growth occurs. It is crucial for the development of the root system.

3. **Presence of the Root Cap**:
- The root apex is covered by a structure known as the root cap. The root cap protects the delicate meristematic tissue at the tip of the root as it pushes through the soil.

4. **Role of the Root Cap**:
- The root cap is essential for the root's growth and navigation through the soil. It helps in the perception of gravity and aids in the direction of root growth.

5. **Conclusion**:
- Because the root apex is covered by the root cap, it is classified as sub-terminal. The root cap occupies the terminal position, which is why the apex is considered just below it.

### Final Answer:
The root apex is sub-terminal because it is covered with the root cap.