Select mismatch from the following

Options

A. Cork - Phellem
B. Secondary cortex- Phelloid
C. Cork cambium - Phellegen
D. Cork + Cork cambium + Secondary cortex- Periderm

Answer

To solve the question of selecting the mismatch from the given options, we will analyze each option based on the definitions and relationships of the terms involved in the context of plant histology.

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Cork (Phallum)**: This is the outer protective layer of the plant, also known as phallum.
- **Cork Cambium (Phallogen)**: This is the layer of meristematic tissue that produces cork cells. It is also referred to as phallogen.
- **Secondary Cortex (Phallodome)**: This layer is found beneath the cork and is also known as phallodome.

2. **Analyzing the Options**:
- **Option 1**: Cork is phallum.
- This is correct as cork is indeed referred to as phallum.
- **Option 2**: Secondary cortex is phalloid.
- This is incorrect. The secondary cortex is actually referred to as phallodome, not phalloid.
- **Option 3**: Cork cambium is phallogen.
- This is correct as cork cambium is indeed called phallogen.
- **Option 4**: Cork + Cork cambium + Secondary cortex = Peridome.
- This is correct. The combination of these three layers forms the periderm.

3. **Identifying the Mismatch**:
- From the analysis, Option 2 is the only mismatch as it incorrectly states that the secondary cortex is phalloid instead of phallodome.

### Conclusion:
The mismatch is **Option 2: Secondary cortex is phalloid**.

---