Which of the following is generally present in dicot stem ?
(i) Endodermis (ii) Pericycle (iii) Medullary ray (iv) Phloem parenchyma (v) pith (vi) Epidermis

Options

A. All except (iii) and (iv)
B. All except (iv)
C. All except ( i ) and (iii)
D. All except (iv)

Answer

To determine which of the following structures are generally present in a dicot stem, let's analyze each option provided:

1. **Endodermis**:
- The endodermis is a layer of cells that surrounds the vascular tissue in roots and stems. In dicot stems, the endodermis is present and is often referred to as the starch sheath.

2. **Pericycle**:
- The pericycle is a layer of cells located just inside the endodermis and is involved in the formation of lateral roots and contributes to the secondary growth in stems. It is present in dicot stems.

3. **Medullary Ray**:
- Medullary rays are radial files of parenchyma cells that extend from the pith to the cortex. They are present in dicot stems and serve in the storage and transport of nutrients.

4. **Phloem Parenchyma**:
- Phloem parenchyma is a type of parenchyma cell that is part of the phloem tissue. While it is present in dicot stems, it is not exclusive to them, but it is generally found in both dicots and monocots.

5. **Pith**:
- Pith is the central part of the stem, composed of parenchyma cells. It is present in dicot stems and serves as a storage area.

6. **Epidermis**:
- The epidermis is the outermost layer of the stem, providing protection. It is present in dicot stems.

Now, summarizing the presence of these structures in dicot stems:
- Endodermis: Present
- Pericycle: Present
- Medullary Ray: Present
- Phloem Parenchyma: Present
- Pith: Present
- Epidermis: Present

Based on the analysis, all the options except for the phloem parenchyma can be considered as generally present in dicot stems. Therefore, the correct answer is "all except 4".

### Final Answer:
All except 4 (Phloem Parenchyma).