First formed vascular cambial ring of dicot root is

Options

A. Circular, continuous
B. Circular, discontinuous
C. Wavy, non-functional
D. Wavy, continuous

Answer

To answer the question regarding the first formed vascular cambial ring of a dicot root, we will follow these steps:

### Step-by-Step Solution:

1. **Understand the Vascular Cambium**: The vascular cambium is a layer of tissue in plants that is responsible for secondary growth. It is crucial in the formation of new xylem and phloem tissues.

2. **Identify the Origin of Vascular Cambium in Dicot Roots**: In dicot roots, the vascular cambium originates from the pericycle tissue. The pericycle is a layer of cells located just beneath the endodermis and surrounds the vascular bundles.

3. **Location of Vascular Cambium**: The vascular cambium forms a ring that is located just below the phloem bundles and above the protoxylem.

4. **Characteristics of the Cambial Ring**: The first formed vascular cambial ring in dicot roots is described as:
- **Continuous**: It forms a complete ring around the vascular bundles.
- **Wavy**: The shape of the cambial ring is not perfectly circular but has a wavy appearance.

5. **Evaluate the Options**: Based on the characteristics identified:
- **Circular Continuous**: Incorrect, as it is not perfectly circular.
- **Circular Discontinuous**: Incorrect, as it is a continuous ring.
- **Wavy Non-Functional**: Incorrect, as it is functional.
- **Wavy Continuous**: Correct, as it matches the identified characteristics.

6. **Conclusion**: Therefore, the first formed vascular cambial ring of a dicot root is **wavy and continuous**.

### Final Answer:
The first formed vascular cambial ring of a dicot root is **wavy and continuous**.

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