In a typical dicotyledonous embryo the cylindrical portion below the level of cotyledons is

Options

A. Scutellum
B. Epicotyl
C. Hypocotyl
D. Radical

Answer

To answer the question regarding the cylindrical portion below the level of cotyledons in a typical dicotyledonous embryo, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of a Dicotyledonous Embryo**:
- A typical dicotyledonous embryo consists of two main parts: the cotyledons and the embryonal axis. The cotyledons are the seed leaves, and they play a crucial role in the early stages of the plant's development.

2. **Identify the Parts of the Embryonal Axis**:
- The embryonal axis is divided into two sections:
- The upper part, which is located above the level of the cotyledons, is known as the **epicotyl**.
- The lower part, which is located below the level of the cotyledons, is referred to as the **hypocotyl**.

3. **Define the Hypocotyl**:
- The hypocotyl is the cylindrical portion of the embryonal axis that extends from the cotyledons downwards. It connects the cotyledons to the root system.

4. **Identify the Root Tip**:
- The hypocotyl terminates at its lower end in the **radicle**, which is the part that will develop into the root. The radicle is often covered by a protective structure called the root cap.

5. **Conclusion**:
- Since the question specifically asks for the cylindrical portion below the level of the cotyledons, the correct answer is the **hypocotyl**.

### Final Answer:
The cylindrical portion below the level of cotyledons in a typical dicotyledonous embryo is the **hypocotyl**.

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