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How can the pistil forming a few days after the stamens keep a plant from self pollinating?

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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/stames 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.
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What is self pollination of plant?

Self-pollination of a plant is where a plant's pollen (from the anthers) lands on the same plant's stigma, causing it to pollinate itself. This is contrasted with cross-pollin

Why are stamens taller than pistil?

They need to let the pollen spread so are therefore of higher importance, so have to be more easily accessed. They help attract bees also and that will lead to the pollination

What does the stamen and pistil do?

  The stamen is the male reproductive system of a plant, while the pistil is the female reproductive system. These parts help the pistil's ovary to produce seeds. The seed

What are the characteristics of self pollinated plants?

There are two types of pollination, cross pollination and self pollination. self pollination occur when male part (androecium) of the flower of one plant pollinated on the fem