The typical flowers of Fabaceae and Solanaceae are similar in having

Options

A. Same number of sepals with same type of aestivation
B. Same number of petals with same type of aestivation
C. Same number of stamens and type of their union
D. Same position of ovary with same type of placentation.

Answer

To determine the similarities between the typical flowers of the Fabaceae and Solanaceae families, we can analyze the characteristics of their floral structures step by step.

### Step-by-Step Solution:

1. **Understanding Flower Structure**:
- Flowers are composed of four main whorls: Calyx, Corolla, Androsium, and Gynosium. Each of these whorls has specific roles in the flower's function and reproduction.

2. **Calyx Comparison**:
- In both Fabaceae and Solanaceae, the calyx consists of 5 sepals.
- These sepals are united in a condition known as gamosepalous, meaning they are fused together rather than separate.

3. **Corolla Comparison**:
- Both families have a similar number of petals, typically 5.
- However, the arrangement of the petals differs: Fabaceae exhibits vexillary estivation (where one petal is larger and overlaps the others), while Solanaceae has valvate estivation (where petals touch but do not overlap).

4. **Androsium Comparison**:
- The number of stamens differs: Fabaceae has 10 stamens arranged in a diadelphous condition (9 joined together and 1 separate), while Solanaceae has 5 free stamens that are connected to the petals (epipetalous condition).

5. **Gynosium Comparison**:
- In Fabaceae, the gynosium is typically monocarpillary (one carpel), whereas in Solanaceae, it is bicarpillary (two carpels).
- However, both families have a superior ovary position.

6. **Conclusion**:
- The primary similarity between the flowers of Fabaceae and Solanaceae lies in the structure of the calyx, specifically that both have 5 united sepals.
- Other floral structures such as corolla, androsium, and gynosium show significant differences.

### Final Answer:
The typical flowers of Fabaceae and Solanaceae are similar in having **5 united sepals in the calyx**.