Monotheceous anther is observed in which of the following family.

Options

A. Brassicaseae
B. Malvaceae
C. Cucurbitaneae
D. Solanaceae

Answer

To determine which family exhibits monotheceous anthers, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Anthers**:
- An anther is a part of the stamen, which is the male reproductive structure of a flower. The stamen consists of two parts: the anther and the filament.

2. **Types of Anthers**:
- There are two main types of anthers based on the number of microsporangia they contain:
- **Monotheceous Anther**: Contains two microsporangia.
- **Diatheceous Anther**: Contains four microsporangia.

3. **Identifying the Families**:
- The question provides four options:
1. Brassicaceae
2. Malvaceae
3. Cucurbitaceae
4. Solanaceae

4. **Analyzing Each Family**:
- **Brassicaceae**: This family typically has diatheceous anthers.
- **Malvaceae**: This family is known to have monotheceous anthers. A well-known example is the hibiscus (Hibiscus rosa-sinensis), also known as China rose.
- **Cucurbitaceae**: This family generally has diatheceous anthers.
- **Solanaceae**: This family also typically has diatheceous anthers.

5. **Conclusion**:
- Based on the analysis, the only family that exhibits monotheceous anthers is **Malvaceae**.

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