Pollination may occur as cross-pollination between plants, or when bees, insects and birds transport and replant pollinated seeds and spores. Pollination takes place naturally in several ways, without human intervention. Some plants have the ability to repopulate among each other via the technique of cross-pollination, although most organisms rely on wind currents or pollinators, such as bees, birds and other insects to complete the process.
Regardless of how it is completed, all methods of pollination begin the same way. Pollution takes place exclusively in flowering plants, which may have male or female reproductive organs, or a combination of both. These plants have parts that are vital for pollination, including stamen and pistils. At the top of each pistil is a sticky liquid substance called stigma. Stigma allows seeds to stick to the interior of the pistil, which is called the ovule. According to Britannica, pollination can take place once seeds settle in the ovule.
During self-pollination, a plant’s stamen is transferred internally to its stigma. During cross-pollination, however, the pollen from a stamen is transferred to the stigma of another plant of the same species. In addition to interspecies exchanges, pollination occurs when animals such as butterflies, moths, hummingbirds and bees carry pollen from one plant to another.