In all the following the gynoecium is unilocular with multiple ovules except

Options

A. Trifolium
B. Lupin
C. Seabania
D. Petunia

Answer

To solve the question, "In all the following the gynoecium is unilocular with multiple ovules except," we need to analyze the options provided and identify which one does not fit the criteria of having a unilocular gynoecium with multiple ovules.

### Step-by-Step Solution:

1. **Understanding Gynoecium**: The gynoecium is the female reproductive part of a flower, which consists of one or more carpels. Each carpel has an ovary, style, and stigma. The ovary contains ovules.

2. **Defining Unilocular and Multiple Ovules**:
- **Unilocular** means having a single chamber in the ovary.
- **Multiple ovules** means that there are several ovules present within that single chamber.

3. **Identifying the Options**: The question likely provides several options, including plants from different families. We need to analyze each option to see if it meets the criteria of having a unilocular ovary with multiple ovules.

4. **Analyzing the Options**:
- **Trifolium** (Clover): This plant belongs to the Fabaceae family and typically has a unilocular ovary with multiple ovules.
- **Lupin**: Also a member of the Fabaceae family, Lupin exhibits the same characteristics as Trifolium, with a unilocular ovary containing multiple ovules.
- **Sesbania**: Another member of the Fabaceae family, Sesbania also has a unilocular ovary with multiple ovules.
- **Petunia**: This plant belongs to the Solanaceae family (potato family) and typically has a bicarpillary condition, meaning it has two carpels and a bilocular ovary (two chambers).

5. **Conclusion**: Since Trifolium, Lupin, and Sesbania all belong to the Fabaceae family and exhibit unilocular ovaries with multiple ovules, the exception is **Petunia**, which has a bilocular ovary.

### Final Answer:
The correct answer is **Petunia**.