BIOL 180 Lecture 30: BIOL 180 - Lecture 30 - Plant Diversification
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What is the one-snip test when considering phylogenetic trees: be able to look at a tree and tell which groups are monophyletic. Cuticles: provides a waxy outer layer on leaves for tree to help keep moisture in, makes sense for it to have originated at the start of land plants. Pores/stomata: pores are always opens/stomata can regulate, pores only close at night or when the system really needs to conserve water, break in cuticle; allows for carbon dioxide to enter. Vascular tissue (consisting of tracheids, or tracheids + vessels: cells specialized for fluid transport, evolved at vascular plants. Gametangia = structures that enclose gamete-producing cells: adaptive significance of the embryophyte condition, giving offspring support at most vulnerable time in life** Pollen: cells that are encased in a tough coat of sporopollenin; some give rise to sperm cells, transported from on plant to another by wind, animals, or water, adaptive significance, more genetic variation.
