Which of the infloresence does not bear bisexual flowers

Options

A. Catkin
B. Capitulum
C. Umbel
D. Raceme

Answer

To determine which type of inflorescence does not bear bisexual flowers, we need to analyze the given options one by one.

### Step-by-Step Solution:

1. **Identify the Inflorescence Types**: The question provides four types of inflorescence: Catkin, Capitulum, Umbel, and Raceme.

2. **Analyze Catkin**:
- A catkin is an inflorescence that typically bears unisexual flowers.
- Examples include oak and morris trees.
- **Conclusion**: Catkin does not bear bisexual flowers.

3. **Analyze Capitulum**:
- A capitulum, also known as a head, consists of small and sessile flowers.
- In a capitulum, there are disc florets which are bisexual and actinomorphic, and ray florets which are pistillate and zygomorphic.
- **Conclusion**: Capitulum does bear bisexual flowers.

4. **Analyze Umbel**:
- An umbel has a reduced main axis, making it appear as if flowers are arising from a single point.
- An example is Hydrocotyle.
- **Conclusion**: Umbel does bear bisexual flowers.

5. **Analyze Raceme**:
- A raceme is characterized by having a peduncle with bisexual and pedicellate flowers.
- Examples include radish and laxper.
- **Conclusion**: Raceme does bear bisexual flowers.

6. **Final Conclusion**: Based on the analysis, the inflorescence that does not bear bisexual flowers is the **Catkin**.

### Final Answer:
The inflorescence that does not bear bisexual flowers is **Catkin**.

---