What is periderm? How does periderm formation take place in dicot stem?

Explanation

### Step-by-Step Solution:

1. **Definition of Periderm**:
- Periderm is a protective layer found in the stems and roots of dicotyledonous plants. It consists of three main components:
- **Phellogen**: Also known as cork cambium, it is a meristematic tissue that produces new cells.
- **Phellem**: Commonly referred to as cork, it is the outer protective layer formed from the cells produced by phellogen.
- **Phelloderm**: This is the inner layer formed from the cells produced by phellogen, which contributes to the secondary cortex.

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