29topic_13_f07

29topic_13_f07 - Topic 13 Topic 13 Reproduction:...

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Unformatted text preview: Topic 13 Topic 13 Reproduction: Reproduction: Flower structure, Flower Types, Inflorescences and Fertilization Reproductive Strategies of the Flower The evolution of the Gymnosperms was attended by the evolution of the seed with a seed coat , enclosed embryo and a food source, the endosperm . The evolution of the Angiosperms added the evolution of the flower and the development of the fruit in which seeds are contained. Reproductive Strategies of the Flower The parts of a flower are all modified leaves . Central to the flower is the ovary inside of which are found the seed precursors, the ovules . The ovary and sometimes other flower parts mature into a fruit after fertilization. Flowers and insects co-evolved . The Four Units of the Flower The flower parts are derived from leaf precursors at four nodes with no internodes. At each of the nodes a whorl of leaf precursors give rise to the flower parts. Starting at the uppermost node the flower units are the gynoecium , the androecium , the corolla , and the calyx . The Four Units of the Flower The gynoecium is the female reproductive structure in which leaf derivatives, carpels , separately or individually form pistils which are composed of a stigma , style and ovary . The Four Units of the Flower The androecium is the male reproductive aggregate of leaves that develop into stamens which are composed of a filament and an anther . The Four Units of the Flower...
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This note was uploaded on 04/08/2008 for the course BIO 29 taught by Professor Mcgowan during the Spring '08 term at CUNY Brooklyn.

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29topic_13_f07 - Topic 13 Topic 13 Reproduction:...

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