Respuesta :
For a flower to be pollinated, pollen from an anther (which is located at the top of the stamen) needs to reach a stigma (at the top of the pistle.) Some plants are genetically capable of pollinating themselves if their own pollen reaches their own stigma; some plants are not capable of self pollination under any circumstances.
For plants that can genetically self pollinate, but would prefer not to, they can avoid this by having their pistil and pollen/stamens mature at different times. If the stamens mature first, the pollen will be dispersed by animals or wind or whatever dispersal mechanism it relies on. Then by the time the pistil is ready to be pollinated, there is no pollen left in that flower to land on the stigma.
Some of the plants possesses the tendency to mature the stamens first before the pistils in order to prevent the process of self-pollination.
• The process in which pollens are transferred to the female reproductive organs of the plant is termed as pollination. Post pollination process of fertilization takes place and formation of new plants occur.
• In some of the plants, the tendency to form and mature the stamens first before the pistils to inhibit the process of self-pollination.
• This takes place because some of the elements of the environment like wind, animals, and others may pre-maturely disperse the pollen into the plant's stigma, and in cases where formation of stamens takes place first, there will be no pollen left in that flower to invade the stigma to initiate the process of fertilization, and thus self pollination get prevented.
Thus, formation of stamens prior to pistil prevents the process of self-pollination in plants.
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