How many of the following tissues given below are formed by dedifferentiation? [Intra-fascicular cambium, inter- fascicular cambium, cork cambium, procambium, phelloderm]

Options

A. Three
B. Two
C. Four
D. Five

Answer

To determine how many of the listed tissues are formed by dedifferentiation, let's analyze each tissue one by one.

1. **Intra-fascicular cambium**: This tissue is formed from the dedifferentiation of parenchyma cells located between the xylem and phloem in vascular bundles. Therefore, it is formed by dedifferentiation.

2. **Inter-fascicular cambium**: This tissue develops from the dedifferentiation of parenchyma cells located between the vascular bundles. Thus, it is also formed by dedifferentiation.

3. **Cork cambium**: This tissue arises from the dedifferentiation of parenchyma cells in the outer layer of stems and roots. Therefore, it is formed by dedifferentiation.

4. **Procambium**: This tissue is a primary meristem that gives rise to the vascular tissues (xylem and phloem) and is not formed by dedifferentiation but is rather a primary meristematic tissue. Thus, it is not formed by dedifferentiation.

5. **Phelloderm**: This tissue is produced by the cork cambium and is not formed by dedifferentiation. It is a secondary tissue that develops from the cork cambium.

Now, let's summarize the findings:
- Intra-fascicular cambium: Yes (formed by dedifferentiation)
- Inter-fascicular cambium: Yes (formed by dedifferentiation)
- Cork cambium: Yes (formed by dedifferentiation)
- Procambium: No (not formed by dedifferentiation)
- Phelloderm: No (not formed by dedifferentiation)

**Total tissues formed by dedifferentiation**: 3 (Intra-fascicular cambium, Inter-fascicular cambium, Cork cambium)

### Final Answer:
**3 tissues are formed by dedifferentiation.**