cork/bottle cork is formed from

Options

A. plerome
B. phellogen
C. phelloderm
D. periderm

Answer

### Step-by-Step Solution

1. **Understanding the Question**: The question asks about the origin of cork, specifically the type used in bottle corks.

2. **Identifying Plant Tissues**: In plants, cork is formed from a specific type of tissue. The relevant tissue for cork formation is the cork cambium, also known as phallogen.

3. **Cork Cambium (Phallogen)**: The cork cambium is a layer of meristematic tissue that produces cork cells. It is responsible for the secondary growth in plants, which increases the girth of stems and roots.

4. **Formation of Cork**: As the plant grows, the cork cambium divides to produce cork cells (phallum) towards the outside and phalloderm (secondary cortex) towards the inside. The cork cells are dead at maturity and are filled with suberin, a waxy substance that makes them impermeable to water and gases.

5. **Analyzing Options**:
- **Option A: Pleurome** - Incorrect, as pleurome refers to the stellar region in the root tip and does not contribute to cork formation.
- **Option B: Phallogen** - Correct, as phallogen is another name for cork cambium, which directly produces cork.
- **Option C: Feloderm** - Incorrect, as feloderm consists of living cells and does not form cork.
- **Option D: Cork** - Incorrect, as this option is redundant; cork is the product of cork cambium.

6. **Conclusion**: The correct answer is **Option B: Phallogen**.