Keel is characteristic of the flower of

Options

A. Bean
B. Gulmohur
C. Cassia
D. Calotropis

Answer

To determine which flower has a keel as a characteristic, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Term "Keel":**
- The keel refers to a structure formed by the fusion of two petals in certain types of flowers. This is commonly seen in the family Fabaceae (legumes).

2. **Identify the Options:**
- The options provided are:
- A) Bean
- B) Gulmohur
- C) Cassia
- D) Calotropis

3. **Analyze Each Option:**
- **Bean:**
- Beans belong to the Fabaceae family and exhibit a vexillary (or papilionaceous) arrangement of petals, where the two anterior petals form a keel.
- **Gulmohur:**
- Gulmohur flowers have an imbricate arrangement of petals, which does not form a keel.
- **Cassia:**
- Cassia also has an imbricate arrangement of petals and does not exhibit a keel.
- **Calotropis:**
- Calotropis has a valvate arrangement of petals, which again does not form a keel.

4. **Conclusion:**
- Since the only flower that exhibits a keel is the Bean, the correct answer is **A) Bean**.

### Final Answer:
The keel is characteristic of the flower of **Bean**.