Phellogen cuts off derivatives on the inner side to form ______and on the outer side to form_____

Options

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

Answer

To answer the question "Phellogen cuts off derivatives on the inner side to form ______ and on the outer side to form _____", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Phellogen**:
- Phellogen, also known as cork cambium, is a type of lateral meristem that is responsible for the secondary growth in plants. It is involved in the formation of protective tissues.

2. **Identifying the Derivatives**:
- Phellogen produces cells on two sides:
- On the **inner side**, it forms the **secondary cortex** (also referred to as phelloderm).
- On the **outer side**, it forms **cork** (or phellem).

3. **Function of the Derivatives**:
- The **secondary cortex** provides mechanical support and storage.
- The **cork** serves as a protective layer, preventing water loss and protecting the plant from external damage.

4. **Final Answer**:
- Therefore, the complete answer to the question is:
- Phellogen cuts off derivatives on the inner side to form **secondary cortex** and on the outer side to form **cork**.