BIOL 2200 Lecture Notes - Lecture 17: Microsporangia, Megaspore, Namib Desert
27 Feb 2017
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Correction about lichen: symbiotic relationship between fungi and algae, not plants, found where there isnt much soil, mutualism between a fungi and green algae (85%) or a fungi and a cyanobacteria. In bryophytes, gametophytes are the dominant life stage. In sporophytes, produces spores through meiosis and cannot live independently on their own: alternations of generations applies to all plants, one innovation of vascular plants is a shift to life cycle dominated by sporophytes. Seedless vascular plants: traits that distinguish them from bryophytes, sporophtyes consists of trees and flowers (more complex, sporophyte generation larger, more complex, not dependent on gamete, transport of resources through vascular system, well developed roots and leaves. Vascular system: xylem how water transported around plant. Tubular cell with lignin in cell walls: phloem. Distributes sugars/amino acids, or other products synthesized by the plant: lignin. Seedless vascular plants: club moss/fern/whisk fern/horsetail, monilophytes (ferns, horsetail, whisk ferns) Ferns very common in moist, humid habitats.
