Identify the correct Statement with respect to secondary growth in dicot roots .
a. Vascular cambium arises from the parenchyma.
b. This secondary meristem is known as interfascicluar cambium
c . The outer layer of pericycle given rise to the phellogen .
d. Growth rings are well Marked and distinct .

Options

A. a,b
B. b,c
C. a,c
D. b,d

Answer

To solve the question regarding secondary growth in dicot roots, we will analyze each statement one by one to determine which are correct.

### Step-by-Step Solution:

1. **Statement A: Vascular cambium arises from the parenchyma.**
- **Analysis:** This statement is correct. The vascular cambium in dicot roots is indeed derived from the parenchyma cells that become meristematic. These cells are located between the primary xylem and primary phloem and differentiate to form secondary xylem and phloem.
- **Conclusion:** Statement A is true.

2. **Statement B: This secondary meristem is known as interfascicular cambium.**
- **Analysis:** This statement is incorrect. The correct term for the cambium located between the vascular bundles (xylem and phloem) is "intrafascicular cambium," not "interfascicular cambium." Interfascicular cambium refers to the cambium that forms between the vascular bundles.
- **Conclusion:** Statement B is false.

3. **Statement C: The outer layer of pericycle gives rise to the phellogen.**
- **Analysis:** This statement is correct. The outer layer of the pericycle, which is located just inside the endodermis, can differentiate to form phellogen (cork cambium), contributing to the formation of the periderm.
- **Conclusion:** Statement C is true.

4. **Statement D: Growth rings are well marked and distinct.**
- **Analysis:** This statement is false. In dicot roots, growth rings are not well marked or distinct. Unlike woody stems, where growth rings can be easily observed, the growth in roots does not typically produce distinct rings.
- **Conclusion:** Statement D is false.

### Final Conclusion:
From the analysis, the correct statements regarding secondary growth in dicot roots are:
- Statement A: True
- Statement C: True

Thus, the correct answer is that both statements A and C are true.