Which of the following is a meristematic tissue

Options

A. Phellem
B. Phellogen
C. Phelloderm
D. Periderm

Answer

To determine which of the given options is a meristematic tissue, we will analyze each option step by step.

### Step 1: Understand Meristematic Tissue
Meristematic tissues are groups of undifferentiated cells that have the ability to divide and differentiate into various types of cells. They are responsible for the growth of plants.

### Step 2: Analyze the Options
The options provided are:
1. Phallogen
2. Phallogen (repeated)
3. Phalloderm
4. Periderm

### Step 3: Identify Each Option
- **Phallogen**: This is a type of meristematic tissue that is responsible for the production of cork (also known as phallum) during secondary growth. It is produced by the pericycle and is also referred to as cork cambium.

- **Phalloderm**: This is a tissue that develops from the phallogen and is part of the cork layer. It is not meristematic as it consists of cells that are dead at maturity.

- **Periderm**: This is the outer protective layer of the plant that includes the cork (phallum), phalloderm, and phallogen. The periderm itself is not meristematic as it is made up of dead cells.

### Step 4: Conclusion
Among the options, only **Phallogen** is a meristematic tissue because it retains the ability to divide and produce new cells, while the others (phalloderm and periderm) consist of dead cells at maturity.

### Final Answer
The correct answer is **Phallogen** (option 1 or 2).

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