Adhesion in a flower is

Options

A. union of dissimilar parts
B. union of similar parts
C. aggregation of similar parts
D. aggregation of dissimilar parts

Answer

### Step-by-Step Text Solution:

1. **Understanding the Term "Adhesion":**
- Adhesion in the context of flowers refers to the joining or fusion of different floral parts. It is important to note that these parts are dissimilar, meaning they are not of the same type.

2. **Identifying Floral Parts:**
- The floral parts include petals, sepals, stamens, and the ovary. Each of these parts has distinct functions and structures.

3. **Definition of Adhesion:**
- Adhesion is defined as the union of dissimilar floral parts. For example, when petals and stamens come together, this is an instance of adhesion.

4. **Example of Adhesion:**
- A specific example of adhesion is the formation of "haplostemonous" flowers, where petals and stamens are united. This condition is particularly observed in the Solanaceae family of plants.

5. **Conclusion:**
- Therefore, the correct interpretation of adhesion in a flower is the union of dissimilar floral parts, which can be exemplified by the haplostemonous condition in certain plant families.

### Final Answer:
- Adhesion in a flower is the union of dissimilar floral parts.