The type of pollination which brings genetically different types of pollen on the stigma is

Options

A. autogamy
B. xenogamy
C. geitonogamy
D. cleistogamy

Answer

To solve the question regarding the type of pollination that brings genetically different types of pollen on the stigma, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Pollination**:
- There are several types of pollination, including autogamy, xenogamy, geitonogamy, and clistogamy. Each has distinct characteristics.

2. **Define Autogamy**:
- Autogamy refers to self-pollination, where pollen grains from the anther of a flower fertilize the stigma of the same flower. This means the pollen is genetically identical to the ovule, thus not bringing genetically different types.

3. **Define Xenogamy**:
- Xenogamy is the process of cross-pollination where pollen grains are transferred from the anther of one flower to the stigma of another flower, which can be from a different plant of the same species. This results in genetically different pollen being deposited on the stigma.

4. **Define Geitonogamy**:
- Geitonogamy involves the transfer of pollen from one flower to another flower of the same plant. Although the flowers are different, the pollen is genetically similar because it comes from the same plant.

5. **Define Clistogamy**:
- Clistogamy is a condition where flowers remain closed and self-pollinate. This also does not result in genetically different pollen.

6. **Conclusion**:
- Based on the definitions and characteristics of each type of pollination, the type that brings genetically different types of pollen on the stigma is **xenogamy**.

### Final Answer:
The type of pollination which brings genetically different types of pollen on the stigma is **xenogamy**.

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