A pentamerous flower having 1 : 1 ratio of the number of non-essential organs and microsporophylls can be assigned to

Options

A. Brassicaceae
B. Fabaceae
C. Solanaceae
D. Liliaceae

Answer

To solve the question regarding a pentamerous flower with a 1:1 ratio of non-essential organs to microsporophylls, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Terms**:
- A **pentamerous flower** is one that has floral organs in multiples of five. This means that the flower should have 5, 10, or 15 of each organ type (sepals, petals, stamens, etc.).
- **Non-essential organs** refer to the accessory whorls of the flower, which include the calyx (sepals) and corolla (petals).
- **Microsporophylls** are the male reproductive organs of the flower, specifically the stamens.

2. **Identifying the Flower Structure**:
- A typical flower has four whorls:
- **Calyx** (sepals)
- **Corolla** (petals)
- **Androecium** (stamens or microsporophylls)
- **Gynoecium** (carpels or pistils)
- For a flower to be considered pentamerous, both the calyx and corolla should have 5 members each.

3. **Analyzing the Ratio**:
- The question states that the ratio of non-essential organs (sepals and petals) to microsporophylls (stamens) should be 1:1.
- If there are 5 sepals and 5 petals, the total number of non-essential organs is 10.
- Therefore, to maintain a 1:1 ratio, there must also be 10 stamens.

4. **Considering the Fabaceae Family**:
- The Fabaceae family, also known as the legume or pea family, typically has flowers that fit this description.
- In many Fabaceae flowers, there are 10 stamens arranged in a diadelphous condition (9 fused together and 1 separate), which still counts as a total of 10 stamens.

5. **Conclusion**:
- Since the Fabaceae family has a flower structure that meets the criteria of being pentamerous and having a 1:1 ratio of non-essential organs to microsporophylls, we can conclude that the answer to the question is **option B (Fabaceae)**.