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Unformatted text preview: ) and lower tracheophytes such as ferns. For more information on the life cycles of plants, see Alternation of Generations . Gymnosperm are also characterized by a specialized fertilization process, involving differentiated male and female gametophytes. Fertilization occurs when pollen grains (male gametophytes) are carried by the wind to the open end of an ovule, which contains the eggs, or female gametophyte. For a (much) more detailed exploration of this process, see gymnosperm fertilization Monocots Monocots, a class of angiosperms that includes grasses, grains, and spring- flowering bulbs, are named for the presence of a single cotyledon (leaf) during embryonic development. In general, the veins of monocot leaves are parallel, the flower parts occur in multiples of three, and a fibrous root system is present. Bundles of vascular tissue are scattered throughout the stem instead of appearing in a single ring....
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