Phellogen and phellem respectively denote

Options

A. cork and cork cambium
B. cork cambium and cork
C. secondary cortex and cork
D. cork and secondary cortex

Explanation

To answer the question "Phellogen and phellem respectively denote," we can break it down step by step:

### Step 1: Understand the Terms
- **Phellogen**: This is a type of meristematic tissue responsible for producing cork. It is also known as cork cambium.
- **Phellem**: This is the outer layer of tissue produced by the phellogen, commonly referred to as cork.

### Step 2: Identify Their Functions
- **Phellogen (Cork Cambium)**: It is located in the outer layers of the stem and is responsible for the secondary growth in plants, specifically in dicots. It produces new cells that contribute to the protective outer layer.
- **Phellem (Cork)**: This is the tissue that is formed on the outer side of the phellogen. It serves as a protective barrier for the plant, preventing water loss and protecting against pathogens.

### Step 3: Conclusion
- Therefore, we can conclude that:
- Phellogen denotes the cork cambium.
- Phellem denotes the cork.

### Final Answer:
Phellogen denotes cork cambium, and phellem denotes cork.

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