The only type of pollination which during pollination brings genetically different types of pollen grains to the stigma is Xenogamy

Answer

**Step-by-Step Solution:**

1. **Understanding Pollination Types**: Begin by identifying the three main types of pollination: autogamy, geitonogamy, and xenogamy.
- Autogamy: Pollination occurs within the same flower.
- Geitonogamy: Pollination occurs between different flowers of the same plant.
- Xenogamy: Pollination occurs between flowers of different plants, which can be of the same species or different species.

2. **Focus on Xenogamy**: The question specifically asks about xenogamy. In xenogamy, pollen grains are transferred from the anther of one flower to the stigma of another flower, which is genetically different. This is crucial because it ensures genetic diversity.

3. **Genetic Differences**: Since xenogamy involves pollen from different plants, it inherently brings genetically different pollen grains to the stigma. This is a key characteristic that distinguishes it from autogamy and geitonogamy, where the pollen is either from the same flower or the same plant.

4. **Conclusion**: Based on the definitions and characteristics of the types of pollination, the statement in the question is true. Xenogamy is indeed the only type of pollination that brings genetically different types of pollen grains to the stigma.

**Final Answer**: The statement is true.

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