Describe secondary growth in a dicot root

Options

A. Vascular cambium is completely secondary in origin
B. Vascular cambium arises only from the tissue located just below the phloem bundle
C. Vascular cambium forms continuous but wavy ring
D. More than one option is correct

Answer

### Step-by-Step Solution for Secondary Growth in a Dicot Root

1. **Definition of Secondary Growth**:
Secondary growth refers to the increase in thickness or girth of the plant, which occurs due to the activity of the vascular cambium and cork cambium.

**Hint**: Remember that secondary growth is primarily responsible for the increase in the diameter of stems and roots.

2. **Vascular Cambium**:
In dicot roots, the vascular cambium is completely secondary in origin. This means that it is formed from the existing tissues rather than being present from the beginning.

**Hint**: Focus on the origin of the vascular cambium and how it differs from monocots.

3. **Formation of Vascular Cambium**:
The vascular cambium arises specifically from the tissues located just below the phloem bundles. This is a crucial point as it indicates the specific location from which the cambium develops.

**Hint**: Think about the relationship between vascular cambium and the surrounding tissues, especially phloem.

4. **Structure of Vascular Cambium**:
The vascular cambium forms a continuous but wavy ring in the dicot root. This wavy structure is important for its function in producing secondary xylem and phloem.

**Hint**: Visualize the arrangement of vascular cambium in the root and how it contributes to the overall structure.

5. **Function of Vascular Cambium**:
The primary function of the vascular cambium is to produce secondary xylem (wood) and secondary phloem (inner bark). This process is vital for the plant's growth and nutrient transport.

**Hint**: Consider the significance of secondary xylem and phloem in the overall health and growth of the plant.

6. **Conclusion**:
Based on the above points, it can be concluded that multiple statements regarding secondary growth in dicot roots are correct. Therefore, the correct answer to the question is that more than one option is correct.

**Hint**: Summarize the key points to reinforce your understanding of secondary growth in dicot roots.