In dicot root, the cambium is -

Options

A. Completely primary in origin
B. Completely secondary in origin
C. Primary as well as secondary in origin
D. Derived from endodermis

Answer

To answer the question about the nature of cambium in a dicot root, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Cambium**: Cambium is a type of meristematic tissue responsible for secondary growth in plants. It is crucial for the formation of secondary xylem and phloem.

2. **Identifying the Types of Cambium**: There are two types of cambium:
- **Primary Cambium**: This is present in the early stages of growth and is responsible for primary growth.
- **Secondary Cambium**: This develops later and is responsible for secondary growth.

3. **Analyzing Dicot Roots**: In dicot roots, the cambium is not present from the beginning. Instead, it develops later in the life of the plant.

4. **Evaluating the Options**:
- **Option 1**: "Completely primary in the origin" - This is incorrect because cambium in dicot roots does not originate primarily.
- **Option 2**: "Completely secondary in the origin" - This is correct as the cambium in dicot roots arises from the pericycle and is secondary in nature.
- **Option 3**: "Primary as well as secondary in the origin" - This is incorrect since the cambium in dicot roots is not primary.
- **Option 4**: "Derived from endodermis" - This is also incorrect as the cambium does not originate from the endodermis.

5. **Conclusion**: Based on the analysis, the correct answer is **Option 2: completely secondary in the origin**.