Which of the following does not ensure aytogamy in viola?

Options

A. Cleistogamy
B. Homogamy
C. Bud pollination
D. Dichogamy

Answer

To determine which of the following does not ensure autogamy in Viola, we need to analyze the options provided. Autogamy refers to self-pollination, where pollen from the same flower fertilizes its own ovules.

### Step-by-Step Solution:

1. **Understanding Autogamy**:
- Autogamy is the process of self-pollination in plants. It occurs when pollen from the same flower fertilizes the ovules of that flower.

2. **Identifying the Options**:
- The options given are:
1. Clistogamy
2. Homogamy
3. Bird pollination
4. Dicogamy

3. **Analyzing Clistogamy**:
- Clistogamy refers to a type of self-pollination where flowers are closed, ensuring that pollen is transferred to the stigma of the same flower. Thus, it ensures autogamy.

4. **Analyzing Homogamy**:
- Homogamy is when the pollen grains mature at the same time as the stigma in the same flower, allowing for self-fertilization. Therefore, it also ensures autogamy.

5. **Analyzing Bird Pollination**:
- Bird pollination typically involves cross-pollination, where pollen is transferred from one flower to another by birds. This does not ensure autogamy.

6. **Analyzing Dicogamy**:
- Dicogamy is a condition where the male and female reproductive structures mature at different times, preventing self-fertilization. Therefore, it does not ensure autogamy.

7. **Conclusion**:
- Among the options, Dicogamy is the only one that does not ensure autogamy in Viola.

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

---