Select the CORRECT pair from the following.

Options

A. Marginal placentation - China rose, pea
B. Parietal placentation - Mustard , Marigold
C. Free central placentation - Dianthus , primrose
D. Basal placentation - Tomato , Lemon

Answer

To solve the question of selecting the correct pair of placentation types and their corresponding plants, we will analyze each option step by step.

### Step 1: Understand the types of placentation
1. **Marginal placentation**: In this type, the placenta forms a ridge along the ventral suture of the ovary, and the ovules develop on this ridge.
2. **Parietal placentation**: Here, the ovules develop on the inner walls of the ovary.
3. **Free central placentation**: In this type, the ovules develop on a central column, and there are no septa dividing the ovary.
4. **Basal placentation**: The ovules are attached at the base of the ovary.

### Step 2: Analyze the options
1. **Marginal placentation, China rose**:
- China rose (Hibiscus rosa-sinensis) has **axial placentation**, not marginal.
- **Incorrect pair**.

2. **Parietal placentation, Mustard, Marigold**:
- Mustard (Brassica) has **parietal placentation**.
- Marigold (Tagetes) has **basal placentation**.
- **Incorrect pair**.

3. **Free central placentation, Dianthus, Primrose**:
- Both Dianthus (carnation) and Primrose (Primula) exhibit **free central placentation**.
- **Correct pair**.

4. **Basal placentation, Tomato, Lemon**:
- Tomato (Solanum lycopersicum) has **axial placentation**, and Lemon (Citrus limon) also has **axial placentation**.
- **Incorrect pair**.

### Conclusion
The only correct pair from the options given is **Free central placentation, Dianthus, Primrose**.