Choose incorrect pair

Options

A. Bark = Periderm + Bast
B. Periderm = Phellem + Phellogen + Phelloderm
C. Annual ring = Late wood + Early wood
D. Cortex = Pericycle + Vascular tissue + Pith

Answer

To solve the question "Choose incorrect pair," we need to analyze each of the provided pairs and determine which one is incorrect. Let's break it down step by step:

### Step-by-Step Solution:

1. **Understanding Bark**:
- Bark is composed of the periderm and the inner soft bark known as the bast.
- The periderm includes the cork (phlegm) and the phellogen (cork cambium).
- **Conclusion**: The statement "Bark = Periderm + Bast" is correct.

2. **Understanding Periderm**:
- Periderm consists of three layers: pheloderm (living parenchyma cells), phellogen (cork cambium), and phlegm (cork).
- **Conclusion**: The statement "Periderm = Pheloderm + Phellogen + Phlegm" is correct.

3. **Understanding Annual Rings**:
- Annual rings are formed by a combination of early wood (springwood) and late wood (summerwood).
- **Conclusion**: The statement "Annual Ring = Latewood + Earlywood" is correct.

4. **Understanding Cortex**:
- Cortex is a tissue layer that lies between the epidermis and vascular tissues in stems and roots.
- The cortex is primarily made up of unspecialized cells and does not include vascular tissue, pericycle, or ground tissue (which is referred to as pith).
- The statement "Cortex = Pericycle + Vascular Tissue + Pith" is incorrect because the cortex does not include vascular tissue or pericycle.
- **Conclusion**: The statement regarding the cortex is incorrect.

### Final Answer:
The incorrect pair is: **Cortex = Pericycle + Vascular Tissue + Pith**.

---