Which is the common part formed due to the activity of vascular cambium and phellogen.

Options

A. Cork
B. Bast
C. Phelloderm
D. Bark

Answer

To answer the question, "Which is the common part formed due to the activity of vascular cambium and phellogen?" we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terms**:
- Vascular cambium is a type of lateral meristem that produces secondary xylem (wood) and secondary phloem (bark).
- Phellogen, also known as cork cambium, is another type of lateral meristem that produces the outer protective layer of the plant, which is cork.

2. **Identify the Products of Each Cambium**:
- The vascular cambium primarily gives rise to:
- Secondary xylem (wood)
- Secondary phloem (part of the bark)
- The phellogen produces:
- Cork (outer protective layer)
- Pheloderm (inner layer of the periderm)

3. **Determine the Common Product**:
- The question asks for a common part formed by both vascular cambium and phellogen.
- The bark is the outer layer of the plant that includes both the secondary phloem (from vascular cambium) and the cork (from phellogen).

4. **Evaluate the Options**:
- Cork: Formed only by phellogen.
- Pheloderm: Formed only by phellogen.
- Bas: This term refers to the secondary phloem, which is formed by vascular cambium.
- Bark: This includes both the secondary phloem (from vascular cambium) and the cork (from phellogen).

5. **Conclusion**:
- The common part formed due to the activity of both vascular cambium and phellogen is **bark**.

### Final Answer:
**Bark** is the common part formed due to the activity of vascular cambium and phellogen.

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