Flowers can attach to stems at widened spots {receptacle}.
Flowers have sepal concentric circles {calyx}|.
Flowers have calyx of outside leaflets {sepal}|.
Flowers have flowery leaves {petal}|.
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.
Flowers have center structures {pistil, flower}|. Pistils have ovaries, styles, and stigmas.
Pistils have top parts {stigma, flower}|.
Pistils have middle parts {style, flower}.
Pistils have egg-making organs {carpel, flower}|, in which ovules develop.
Carpels have female sex cells {ovule}. Ovules develop to make eight nuclei, of which one becomes egg nucleus, two become polar nuclei, three are generative nuclei, and two form tube nuclei.
Ovules develop to make sacs {megasporangium}, with female spores {megaspore}.
Flowers have female sex organs {archegonia}.
4-Botany-Plant-Vascular-Angiosperm-Flower
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Date Modified: 2022.0225