Flowers have anthers on structures {stamen}|.
Flowers can have male sex organs {anther}| {antheridia} to make male sex cells, which make pollen sacs on stamens.
Anther sacs {microsporangia} develop male sex cells into microspores.
Microsporangia develop male sex cells into four spores {microspore}. Two microspores are tube nuclei. Two microspores are generative nuclei. One tube nucleus and one generative nucleus make one pollen grain, so process makes two pollen grains.
One tube nucleus and one generative nucleus make one grain {pollen grain} {pollen}|. Pollen grains leave stamens to try to land on stigmas.
4-Botany-Plant-Vascular-Angiosperm-Flower-Parts
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Date Modified: 2022.0225