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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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- Fall '10