The receptacle is flattened at the top and bears numerous sessile flowers in centripeltal manner in

Options

A. cynathium
B. catkin
C. umbel
D. capitulum

Answer

To solve the question regarding the type of inflorescence where the receptacle is flattened at the top and bears numerous sessile flowers in a centripetal manner, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Receptacle**: The thickened part of the stem from which flowers arise.
- **Sessile Flowers**: Flowers that do not have a stalk (pedicel) and are directly attached to the receptacle.
- **Centripetal Manner**: Flowers opening from the outside towards the center.

2. **Analyzing the Options**:
- **Scythium**: A type of compound inflorescence found in plants like Euphorbia, characterized by a single female flower surrounded by male flowers. This does not match our description.
- **Catkin**: A spike of unisexual flowers that are drooping and break off from the parent plant. This does not fit the description either.
- **Umbel**: A simple inflorescence where flowers are arranged on a short floral axis in a radiating manner. This is not centripetal.
- **Capitulum**: This inflorescence has a fleshy, dilated receptacle with numerous small, sessile flowers. The flowers open in a centripetal manner, with marginal flowers often being different from central flowers.

3. **Identifying the Correct Answer**:
- Based on the analysis, **Capitulum** is the correct type of inflorescence that matches the description given in the question. It is characterized by a flattened receptacle that bears numerous sessile flowers arranged centripetally.

4. **Conclusion**:
- Therefore, the answer to the question is **Capitulum**, which is characteristic of plants like Helianthus (sunflower).