During secondary growth in dicot stem complimentary cells are formed from

Options

A. Interfascicular cambium
B. Vascular cambium
C. Phellogen
D. 2 and 3

Answer

**Step-by-Step Solution:**

1. **Understanding Secondary Growth in Dicot Stem:**
- Secondary growth refers to the increase in the girth of the plant stem and roots, primarily occurring in dicots and gymnosperms. This growth is facilitated by the activity of the cambium.

2. **Identifying the Role of Cambium:**
- Cambium is a type of meristematic tissue responsible for secondary growth. It consists of two types: the vascular cambium and the cork cambium (also known as phellogen).

3. **Differentiating Between Types of Cambium:**
- The vascular cambium produces secondary xylem (wood) and secondary phloem (bark). The cork cambium (phellogen) produces cork cells, which are part of the protective outer layer of the stem.

4. **Understanding Complementary Cells:**
- Complementary cells are associated with the cambium and play a role in the structure and function of the plant, particularly in gas exchange and providing strength.

5. **Identifying the Source of Complementary Cells:**
- In the context of the question, complementary cells during secondary growth in a dicot stem are formed from the cork cambium (phellogen). This is because the cork cambium is responsible for producing the outer protective layer and associated cells.

6. **Conclusion:**
- Therefore, the correct answer to the question is that during secondary growth in a dicot stem, complementary cells are formed from the cork cambium, also known as phellogen.

**Final Answer:**
Complementary cells during secondary growth in a dicot stem are formed from the cork cambium (phellogen).

---