The collective used for phelloderm cork cambium and cork is

Options

A. pericycle
B. periderm
C. protoderm
D. procambium

Answer

To solve the question regarding the collective term for phelloderm, cork cambium, and cork, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Components**:
- **Phelloderm**: This is the inner layer of the periderm, formed by the cork cambium.
- **Cork Cambium**: Also known as phellogen, this is a type of lateral meristem that produces cork (phellem) on the outside and phelloderm on the inside.
- **Cork**: This is the outer protective layer produced by the cork cambium.

2. **Identify the Collective Term**:
- The three components mentioned (phelloderm, cork cambium, and cork) are all part of a structure that serves a protective function in plants.

3. **Define the Structure**:
- The collective term that encompasses phelloderm, cork cambium, and cork is known as **periderm**.

4. **Conclusion**:
- Therefore, the answer to the question is that the collective term for phelloderm, cork cambium, and cork is **periderm**.

### Final Answer:
The collective term for phelloderm, cork cambium, and cork is **periderm**.