The cylindrical portion below the level of cotyledons on embryonal axis is

Options

A. epicotyl
B. hypocotyl
C. radicle
D. plumule

Answer

To solve the question regarding the cylindrical portion below the level of cotyledons on the embryonal axis, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Embryonal Axis**: The embryonal axis is a part of the seed that connects the cotyledons (seed leaves) to the root. It consists of different regions, each with specific roles in plant development.

2. **Identifying Cotyledons**: Cotyledons are the first leaves that appear on the embryonic plant. In dicot seeds, there are typically two cotyledons.

3. **Defining Epicotyl and Hypocotyl**:
- **Epicotyl**: This is the part of the embryonal axis that is located above the level of the cotyledons. It eventually develops into the shoot system of the plant.
- **Hypocotyl**: This is the part of the embryonal axis that is located below the cotyledons. It connects the cotyledons to the root and plays a crucial role in the development of the plant's root system.

4. **Identifying the Correct Answer**: Since the question specifically asks for the cylindrical portion below the level of the cotyledons, we can conclude that the correct answer is the hypocotyl.

5. **Final Answer**: The cylindrical portion below the level of cotyledons on the embryonal axis is the **hypocotyl**.