Which of the following family has unilocular, monocarpellary ovary and diadelphous androecium?

Options

A. Cruciferae
B. Liliaceae
C. Fabaceae
D. Compositae

Explanation

To solve the question regarding which family has a unilocular, monocarpellary ovary and diadelphous androecium, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terms**:
- **Unilocular Ovary**: This means the ovary has only one chamber (locule).
- **Monocarpellary Ovary**: This indicates that the ovary is formed from a single carpel.
- **Diadelphous Androecium**: This refers to the condition where the stamens are united into two bundles.

2. **Identify the Families**:
- The options provided are:
- **Cruciferae (Brassicaceae)**
- **Liliaceae**
- **Fabaceae**
- **Compositae (Asteraceae)**

3. **Analyze Each Family**:
- **Cruciferae**: Typically has a bicarpellary ovary and does not fit the criteria.
- **Liliaceae**: Generally has a superior ovary but does not exhibit diadelphous stamens.
- **Fabaceae**: Known for having a unilocular, monocarpellary ovary and diadelphous androecium. This family includes legumes like peas and beans.
- **Compositae**: Usually has a compound ovary and does not fit the criteria.

4. **Conclusion**:
- The family that meets all the criteria of having a unilocular, monocarpellary ovary and diadelphous androecium is **Fabaceae**.

### Final Answer:
The correct answer is **Fabaceae (Option 3)**.

---