Diadelphous (9 +1) stamens occur in

Options

A. Gramineae
B. Cucurbitaceae
C. Papilionatae
D. Malvaceae

Answer

To solve the question regarding the occurrence of diadelphous (9 + 1) stamens, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Stamens**:
- The stamen is the male reproductive part of a flower, consisting of two main parts: the filament (a thread-like structure) and the anther (where pollen is produced).

2. **Types of Stamen Fusion**:
- Stamens can be classified based on the fusion of their filaments. The main types are:
- **Monadelphous**: All filaments are fused into a single tube.
- **Diadelphous**: Filaments are fused in two groups, typically 9 are fused and 1 remains free, hence referred to as 9 + 1.
- **Polyadelphous**: Filaments are fused in more than two groups.

3. **Identifying Diadelphous Condition**:
- The diadelphous condition (9 + 1) is characteristic of the family **Papilionaceae** (also known as Leguminosae), which includes plants like peas, beans, and legumes.

4. **Analyzing the Options**:
- The question provides four options: Graminae, Curcubitaceae, Papilionaceae, and Malvaceae.
- From our understanding, the diadelphous condition is specifically found in **Papilionaceae**.

5. **Conclusion**:
- Therefore, the correct answer to the question is **Papilionaceae**.

### Final Answer:
The diadelphous (9 + 1) stamens occur in **Papilionaceae**.

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