A family has the characters given in the list below .
Flowers pentamerous, gynoecium-bicarpellary, syncarpous, superior ovary, placentation axile, placenta swollen.
A representive organism from this family is

Options

A. Solanum tuberosum
B. Pisum sativum
C. Brassica napus
D. Allium cepa

Answer

To solve the question regarding the family characteristics and identify a representative organism, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Characteristics**:
- The question provides specific characteristics of a plant family:
- Flowers are pentamerous (5-parted).
- Gynoecium is bicarpellary (two carpels).
- Syncarpous (carpels are fused).
- Superior ovary (ovary is above other floral parts).
- Axile placentation (seeds attached to the central axis).
- Swollen placenta (bulging structure of the placenta).

2. **Analyze the Characteristics**:
- Each of these characteristics is typical of certain plant families.
- The pentamerous flower structure suggests a family that commonly has five petals.
- The syncarpous and bicarpellary nature indicates that the carpels are fused, which is common in many flowering plants.

3. **Determine the Family**:
- The combination of these characteristics points towards the **Solanaceae** family, also known as the nightshade family.
- This family includes many well-known plants, such as tomatoes, potatoes, and eggplants.

4. **Identify a Representative Organism**:
- Among the options provided, **Solanum tuberosum** (the potato) is a well-known representative of the Solanaceae family.
- Other options like Pisum sativum (pea), Brassica napus (rapeseed), and Allium cepa (onion) belong to different families (Fabaceae, Brassicaceae, and Liliaceae respectively).

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