In which of the following plants unisexual and bisexual flowers are arranged centripetally on a condensed axis of the inflorescenc?

Options

A. Sunflower
B. Allium
C. Cassia
D. Musa

Answer

To answer the question regarding which plants have unisexual and bisexual flowers arranged centripetally on a condensed axis of the inflorescence, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terms**:
- **Centripetal Arrangement**: This refers to the arrangement of flowers where the younger flowers are located towards the center and the older flowers are towards the outside.
- **Unisexual and Bisexual Flowers**: Unisexual flowers have either male or female reproductive organs, while bisexual flowers have both.

2. **Identify the Plant Families**:
- We need to focus on the plant families that are known for having centripetal arrangements of flowers.

3. **Examine the Options**:
- **Sunflower (Asteraceae/Daisy Family)**: Sunflowers are known to have a head of flowers where both unisexual and bisexual flowers can be found, arranged centripetally.
- **Allium (Onion Family)**: Allium species typically have flowers arranged in an umbel, which does not exhibit a centripetal arrangement.
- **Cassia (Legume Family)**: Cassia flowers are usually arranged in racemes, which also do not show a centripetal arrangement.
- **Musa (Banana Family)**: Musa species have flowers arranged in racemes as well, lacking the centripetal arrangement.

4. **Conclusion**:
- After analyzing the options, the only plant that exhibits a centripetal arrangement of unisexual and bisexual flowers is the **Sunflower**.

### Final Answer:
The correct option is **Sunflower**.