The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which, during pollination, brings genetically different types of pollen grains to stigma, is :

The process described involves the movement of pollen from the anther of one plant to the stigma of a different plant.

During pollination there are two broad categories:

1. Self‑pollination – pollen reaches the stigma of the same plant (or another flower on the same plant).
2. Cross‑pollination – pollen reaches the stigma of a genetically different plant.

Cross‑pollination itself can be further divided based on the spatial relationship of the donor and recipient plants:

- Geitonogamy: transfer between different flowers of the same individual plant.
‑ Xenogamy: transfer between flowers of separate, genetically distinct individuals.

The key phrase in the question is “brings genetically different types of pollen grains to stigma.” This explicitly rules out self‑pollination and geitonogamy, both of which involve genetically identical pollen.

Therefore, the term that precisely matches the definition given is Xenogamy, which denotes cross‑pollination between different plants, ensuring genetic diversity in the resulting fertilization.