Reproduction of flowering plants – how?
Reproduction in flowering plants begins with pollination, the transfer of pollen from anther to stigma on the same flower or to the stigma of another flower on the same plant (self-pollination) or from the anther on one plant to the stigma of another plant (cross-pollination).
Once the pollen grain lodges on the stigma, a pollen tube grows from the pollen grain to an ovule.
Two sperm nuclei then pass through the pollen tube.
One of them unites with the egg nucleus and produces a zygote.
The other sperm nucleus unites with two polar nuclei to produce an endosperm nucleus. The fertilized ovule develops into a seed.
What is self-pollination?
When the transfer of pollen happens from anther to stigma on the same flower or to the stigma of another flower on the same plant then it is called self-pollination.
What is cross-pollination?
When the transfer of pollen happens from the anther on one plant to the stigma of another plant then it is called cross-pollination.
What is Pistil?
The pistil is the female reproductive part of a flower.
The pistil, centrally located, typically consists of a swollen base, the ovary, which contains the potential seeds, or ovules; a stalk, or style, arising from the ovary; and a pollen-receptive tip, the stigma, variously shaped and often sticky.
In pollination, compatible pollen grains land on the stigma and then germinate, forming a pollen tube. The pollen tube grows down through the tissue of the style to deposit sperm for the fertilization of the ovules in the ovary.
Pistils in the collective sense form the gynoecium, in distinction to the male reproductive parts, or androecium.
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