Ch 38 Plant Reproduction

Ch 38 Plant Reproduction - CHAPTER 38 PLANT REPRODUCTION...

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CHAPTER 38 PLANT REPRODUCTION Angiosperm Reproduction & Biotechnology
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Floral Organs
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Sepals and petals are nonreproductive organs. Sepals : enclose and protect the floral bud before it opens; usually green and more leaf-like in appearance. In many angiosperms, the petals are brightly colored to attract pollinators.
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Stamens : male reproductive organs Stalk : the filament Anther : pollen sacs. - The pollen sacs produce pollen.
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Carpels : female reproductive organs Ovary - base of the carpel - Ovules - Egg cell - Embryo Sac (female gametophyte), i.e., seed Stigma - platform for pollen grain Style - slender neck, connects ovary and stigma
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The stamens and carpels of flowers contain sporangia, within which the spores and then gametophytes develop. The male gametophytes are sperm- producing structures called pollen grains , which form within the pollen sacs of anthers. The female gametophytes are egg- producing structures called embryo sacs , which form within the ovules in ovaries.
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Pollination begins the process by which the male and female gametophytes are brought together so that their gametes can unite. Pollination- when pollen released from anthers lands on a stigma. Each pollen grain produces a pollen tube, which grows down into the ovary via the style and discharges sperm into the embryo sac, fertilizing the egg. The zygote gives rise to an embryo. The ovule develops into a seed and the entire ovary develops into a fruit containing one or more seeds. Fruits disperse seeds away from the source plant where the seed germinates.
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Function of Flowers
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Classification of Flowers Complete Versus Incomplete Flowers Complete : possess sepals, petals, stamens, and carpels Incomplete : lack one or more of these components
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This note was uploaded on 04/20/2011 for the course BIOL 172 taught by Professor Huddleston,m during the Spring '08 term at University of Hawaii, Manoa.

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Ch 38 Plant Reproduction - CHAPTER 38 PLANT REPRODUCTION...

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