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Flowers1 - insect pollination bearing numerous white or...

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Flowers Flowers are collections of reproductive and sterile tissue arranged in a tight whorled array having very short internodes . Sterile parts of flowers are the sepals and petals . When these are similar in size and shape, they are termed tepals. Reproductive parts of the flower are the stamen (male, collectively termed the androecium ) and carpel (often the carpel is referred to as the pistil , the female parts collectively termed the gynoecium ). Lily flowers (shown in Figure 10) demonstrates these concepts. Flowers may be complete , where all parts of the flower are present and functional, or incomplete , where one or more parts of the flower are absent. Many angiosperms produce a single flower on the tip of a shoot (like the lily pictured in Figure 10, or tulips). Other plants produce a stalk bearing numerous flowers, termed an inflorescence, such as is seen in many orchids. Many flowers show adaptations for
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Unformatted text preview: insect pollination, bearing numerous white or yellow petals. Others, like the grasses, oaks, and elms, are wind pollinated and have their petals reduced and often inconspicuous. Angiosperm Life Cycle Flowering plants also exhibit the typical plant alternation of generations, shown in Figure 11. The dominant phase is the sporophyte, with the gametophyte being much reduced in size and wholly dependant on the sporophyte for nutrition. The is not a unique angiosperm condition, but occurs in all seed plants as well. What makes the angiosperms unique is their flowers and the "double fertilization" that occurs. Technically this is not double fertilization, but rather a single egg-sperm fusion (fertilization proper) plus a fusion of the second of two sperm cells with two haploid cells in the female gametophyte to p[produce triploid (3n) endosperm, a nutritive tissue for the developing embryo....
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