When pollen of a flower is transferred to the stigma of another flower of the same plant, the pollination is referred to as

The correct option is D Geitonogamy
Self-pollination is when pollen from the same plant arrives at the stigma of a flower or at the ovule (in gymnosperms).

There are two types of self-pollination.

• In autogamy, pollen is transferred to the stigma of the same flower.
• In geitonogamy, pollen is transferred from the anther of one flower to the stigma of another flower on the same flowering plant, or from microsporangium to ovule within a single (monoecious) gymnosperm.

Some plants have mechanisms that ensure autogamy, such as flowers that do not open, or stamens that move to come into contact with the stigma. In plants, allogamy is used specifically to mean the use of pollen from one plant to fertilize the flower of another plant. Xenogamy is fertilization of a flower by pollen from a flower on a genetically different plant.

Therefore, the correct answer is option D.