Video narration
Have you seen a bee carry pollen from one flower to another? How does that pollen reach the stigma? When pollen moves from anther to stigma, it is pollination. Now track where it lands. If it reaches the stigma of the same flower, it is autogamy. If it moves to another flower on the same plant, it is geitonogamy. And if it travels to a flower on a different plant of the same species, it is xenogamy—the genetic form of cross-pollination. Wind, water, insects, birds, and other animals can carry pollen. But here is the NEET trap: geitonogamy looks like cross-pollination because two flowers are involved. Genetically, though, it is closer to autogamy, because both flowers belong to the same plant. So, how does pollen reach the stigma? From anther to stigma—and the destination gives you the answer: autogamy, geitonogamy, or xenogamy.