Which one of the following can be considered as genetically self but functionally cross pollination?

Options

A. Autogamy
B. Geitonogamy
C. Xenogamy
D. Both (1) & (3)

Answer

To solve the question "Which one of the following can be considered as genetically self but functionally cross pollination?", we need to analyze the options provided: autogamy, geitonogamy, xenogamy, and both 1 and 3.

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Autogamy**: This is a form of self-fertilization where pollen from the same flower fertilizes its own ovules. It is genetically self because the gametes come from the same individual.
- **Geitonogamy**: This involves the transfer of pollen from the anther of one flower to the stigma of another flower on the same plant. Although it involves two flowers, they are genetically identical since they are from the same plant.
- **Xenogamy**: This is the transfer of pollen from the anther of a flower to the stigma of a flower on a different plant, even if they are of the same species. This is considered true cross-pollination and is genetically different.

2. **Analyzing the Options**:
- **Autogamy**: Genetically self, but not functionally cross-pollination.
- **Geitonogamy**: Genetically self (same plant) but functionally cross-pollination (involves different flowers).
- **Xenogamy**: Genetically different and functionally cross-pollination.
- **Both 1 and 3**: This option cannot be correct since autogamy is not functionally cross-pollination.

3. **Conclusion**:
- The only option that fits the criteria of being genetically self but functionally cross-pollination is **Geitonogamy**.

### Final Answer:
The correct answer is **Geitonogamy**.

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