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 solve the question regarding how many of the listed tissues are formed by dedifferentiation, we need to analyze each tissue type mentioned:

1. **Intra-fascicular cambium**: This is a type of cambium found between the xylem and phloem in vascular bundles. It arises from the dedifferentiation of parenchyma cells in the vascular bundles.

2. **Inter-fascicular cambium**: This cambium forms between the vascular bundles in the stem. It is also derived from the dedifferentiation of parenchyma cells.

3. **Cork cambium**: This tissue is responsible for producing cork cells and is formed from the dedifferentiation of the outer layer of the stem (epidermis or outer parenchyma).

4. **Procambium**: This is a primary meristematic tissue that gives rise to the vascular tissues (xylem and phloem) during the development of the plant. It does not arise from dedifferentiation but is formed during the initial stages of development.

5. **Phelloderm**: This is a tissue produced by the cork cambium, and it is not formed from dedifferentiation but rather as a product of the cork cambium's activity.

Now, summarizing the tissues formed by dedifferentiation:
- Intra-fascicular cambium: Yes (dedifferentiation)
- Inter-fascicular cambium: Yes (dedifferentiation)
- Cork cambium: Yes (dedifferentiation)
- Procambium: No (not dedifferentiation)
- Phelloderm: No (not dedifferentiation)

Thus, the tissues formed by dedifferentiation are:
- Intra-fascicular cambium
- Inter-fascicular cambium
- Cork cambium

Total: 3 tissues.

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