Seedless Nonvascular PlantsIncludes mosses, liverworts, and hornwortsLack vascular tissue (xylem & phloem) to carry water & foodHave a Sporophyte & Gametophyte stage known asalternation of generationsGametophyte is dominant stageReproduce by sporesDivision  Bryophyta Mosses:Small, nonvascular land plantsNo true roots, stems, or leavesClass MusciMost common bryophyteGrow on moist areas (brick walls, as thick mats on forest floors, and on the shaded side of trees)Some can survive periodic dry spells & revive when H2O becomes availableMust grow close together and must have H2O to complete their life cycle Sperm swims to egg through drops of water during fertilizationH2O moves cell-to-cell by osmosisSphagnum moss is known for its moisture holding capacity, absorbing up to 20 times its dry weight with water.
LIFE CYCLE OF MOSSES:Mosses alternate between a haploid (n) gametophytestage & a diploid (2n) sporophyte stage Gametophyte is the dominant generationMoss GametophyteMoss Sporophyte
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Gametes are reproductive cells or sex_ cells containing the haploid set of chromesomes that produce an living person.To be a gamete, the cell must contain half the chromosomes of a somatic cell. Sperm cells and the ovum are good examples.
Pollination typically is the process that transfers pollen grains, which contain the male gametes (sperm) to where the female gamete (egg) is inside the carpel. The gametophyte make gametes by mitosis within either antheridium (producing sperm) or archegonium (producing eggs).