Keel is characteristic of the flower of

Options

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

Answer

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

### Step-by-Step Solution:

1. **Understand the term "keel":**
- The keel refers to a specific arrangement of petals in certain flowers, particularly those belonging to the family Papilionaceae (also known as the legume family or Fabaceae).

2. **Identify the family associated with the keel:**
- The keel is a characteristic feature of flowers in the family Papilionaceae. In this family, the innermost petals are fused together to form the keel, also known as the carina.

3. **Analyze the options provided:**
- The options given are:
- A) Calotropis
- B) Bean
- C) Gulmohar
- D) Cassia

4. **Determine the family of each option:**
- **Calotropis:** Belongs to the family Apocynaceae (not Papilionaceae).
- **Gulmohar:** Belongs to the family Fabaceae, but does not have the typical keel arrangement.
- **Bean:** Belongs to the family Fabaceae and exhibits the keel characteristic.
- **Cassia:** Also belongs to the family Fabaceae, but does not have the typical keel arrangement.

5. **Identify the correct answer:**
- Since the bean flower has the keel characteristic typical of the Papilionaceae family, the correct answer is **B) Bean**.

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