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Unformatted text preview: BIOL 112 Laboratory Review PLANT DIVERSITY II : Gymnosperms have naked seeds. Angiosperms have seeds enclosed in fruits. Advantages of seeds on page 80. Seed plants are heterosporous. They produce microspores and megaspores. The cones, or strobili , are modified leaves or branches that serve as the reproductive structures of the sporophyte generation. Male cone is microstrobilus; Female cone is called a megastrobilus. Pollination occurs when the pollen grain is transferred to the part of the seed plant that contains the ovule. Fertilization occurs when the sperm nucleus joins with the egg nucleus. Ginkgo lacks female cones. Paired ovules occur on the branch tips where they are pollinated by pollen produced in a male strobilus. Each staminate cone consists of a microsporopyll bearing two microsporangia on each...
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