classnotes17 - Plant reproduction: Flowers are reproductive...

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Plant reproduction: Flowers are reproductive structures in plants [Fig. 31.9A, p. 634] : Sepals - cover/protect the flower before it opens. Petals - the brightly colored parts of the flower (if it is colored). Stamens - male reproductive parts. Composed of: anthers - where pollen develop and are stored filaments - structures holding up anthers Carpels - female reproductive parts. Composed of: stigma - at tip of carpel, where pollen are placed. ovary - contain ovules, which hold eggs and supporting cells. Fertilization [Fig. 31.10, p. 635] : - egg or sperm are also known (in plants) as gametophytes. These are haploid (have half the number of chromosomes). - in this case, though, the gametophytes generally make just sperm and/or egg. They don't make an “individual”. - sperm formation is pretty straight forward. By meiosis, four haploid “spores” develop. - but again, in this case, the “spores” don't really make an “individual” like in mosses or ferns - instead they go almost directly to making egg or sperm (and a few associated structures) - each spore then divides again, forming a tube cell and generative cell. - the tube cell eventually forms a tube leading to the ovary
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This note was uploaded on 07/21/2011 for the course BIO 101 taught by Professor Staff during the Spring '08 term at Northern Virginia Community College.

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classnotes17 - Plant reproduction: Flowers are reproductive...

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