Explain: Monadelphous cohesion of stamens.

Answer

### Step-by-Step Text Solution:

1. **Definition of Cohesion of Stamens**:
- Cohesion of stamens refers to the phenomenon where the stamens of a flower are united by their filaments. This means that instead of each stamen being separate, they are connected together.

2. **Types of Cohesion**:
- There are different types of cohesion of stamens, one of which is called "monadelphous" cohesion.

3. **Explanation of Monadelphous Cohesion**:
- In monadelphous cohesion, all the stamens are united specifically by their filaments. This means that while the filaments (the stalks of the stamens) are fused together, the anthers (the pollen-producing part) remain free and separate.

4. **Formation of the Tube**:
- Due to the fusion of the filaments, a tubular structure is formed around the style (the part of the flower that connects the stigma to the ovary). This tube is significant for the process of pollination.

5. **Example of Monadelphous Cohesion**:
- A common example of a flower exhibiting monadelphous cohesion of stamens is the hibiscus (also known as china rose). In hibiscus flowers, you can observe that the stamens are fused at their bases, forming a tube around the style, while the anthers are free.

6. **Diagram Representation**:
- To visualize this concept, a diagram can be drawn showing the hibiscus flower with its stamens united by filaments and the anthers positioned freely at the top.