BIOA02H3 : Lec07 - From Tree to Seed.doc

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BIOA02H3 Full Course Notes
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BIOA02H3 Full Course Notes
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Slide one sex in plants: plant sex organs, more varied than animal sex, how to avoid selfing, sex slaves of the plant kingdom. Slide two generalized flower structure: stamen, anther, filament, carpel, stigma, style, ovary, petal, sepal. Slide three sepals: protect inner flower organs before bud opens. Frequently green: can be fused to form tube, i. e. either fused or individuals. Slide four petals: typically colourful to attract pollinators, can be fused to form tube. Slide five stamen: pollen producing, anther has four pollen sacs, once pollen grains are ripe the space between the pollen sac is opened and releases pollen. Slide six carpel: stigma: stigma, sticky landing platform for pollen, morphology of stigma to prevent pollen from falling off once landed. Slide seven carpel: style: style, connects stigma with ovary. Slide eight / nine carpel: ovary / ovule: ovary contains one to multiple ovules, ovule contains egg cell. Four whorls (components: sepals, petals, stamen, carpel.

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