Mark the odd option (w.r.t contrivances of autogamy)

Options

A. homogamy
B. cleistogamy
C. dicliny
D. bud pollination

Answer

### Step-by-Step Solution:

1. **Understanding Autogamy**: Autogamy refers to self-pollination, where pollen from the anther of a flower fertilizes the ovule of the same flower. This occurs when both male (stamen) and female (carpel) reproductive organs are present in the same flower.

2. **Analyzing the Options**:
- **Homogamy**: This is a condition where the male and female organs mature at the same time within the same flower, facilitating self-pollination. Therefore, it is not the odd one out.
- **Clistogamy**: This refers to a type of self-pollination where the flower remains closed and does not open, ensuring that self-pollination occurs. This also aligns with autogamy, so it is not the odd one out.
- **Declining**: In this scenario, the male and female organs are located on different flowers, indicating that the plant is unisexual. This prevents self-pollination (autogamy) from occurring, making it the odd one out.
- **Bud Pollination**: This occurs when the flower buds open, allowing for self-pollination. This is similar to autogamy, so it is not the odd one out.

3. **Identifying the Odd Option**: Based on the analysis, "Declining" is the odd option because it does not allow for autogamy due to the separation of male and female organs on different flowers.

### Final Answer:
The odd option with respect to contrivances of autogamy is **Declining**.

---