The vascular cambium of dicot root originates from the

Options

A. tissue located just below the phloem bundles & a portion of pericycle tissue .
B. tissue located just below the xylem bundles & a pericycle tissue.
C. tissue located just below the xylem bundles & a portion of endodermis tissue
D. tissue located just below the phloem bundles & a portion of endodermis tissue.

Answer

To solve the question regarding the origin of the vascular cambium in dicot roots, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Vascular Cambium**:
- The vascular cambium is a type of lateral meristem responsible for secondary growth in plants, producing secondary xylem (wood) and secondary phloem (bark).

2. **Identifying the Origin**:
- In dicot roots, the vascular cambium originates from specific tissues. We need to analyze the options given in the question to determine which tissues contribute to the formation of the vascular cambium.

3. **Analyzing the Options**:
- **Option 1**: Tissue located just below the phloem bundles and a portion of the pericycle.
- **Option 2**: Tissue just below the xylem bundles and a portion of the pericycle.
- **Option 3**: Tissue located just below the xylem bundles and a portion of the endodermis.
- **Option 4**: Tissue located just below the phloem bundles and a portion of the endodermis.

4. **Correct Identification**:
- The vascular cambium in dicot roots primarily arises from the parenchyma cells located between the xylem and phloem, as well as from the pericycle. The pericycle is a layer of cells that can divide and contribute to the formation of the cambium.

5. **Conclusion**:
- After analyzing the options, the correct answer is **Option 1**: Tissue located just below the phloem bundles and a portion of the pericycle.

### Final Answer:
The vascular cambium of dicot root originates from the tissue located just below the phloem bundles and a portion of the pericycle.

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