BISC 102 Chapter Notes - Chapter 30, 24: Cell Wall, Non-Vascular Plant, Microsporangia
19 Jan 2018
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Co2 is more abundant in atmosphere, diffuses more quickly. Moving water from tissues with direct access to water to tissues w/o direct access. Cuticle = prevents water loss from stems and leaves. Stomata : pores opens/closes as guard cells change shape. Open pore due to an inflow of water. Open allows co2 to diffuse into interior of leaves and stems. Fossils: elongated cells = part of water-conducting tissue. Allows water to move from base of plants upward. Some fossilized water-conducting cells had cellulose in cell walls like the water-conducting cells in today"s mosses. Evolution of lignin rings gave stem tissue strength to remain erect. Lignin in cell walls of water-conducting cells = in vascular tissue. Water-conducting cells (tracheids) in rocks that were about 380 million years have thickened, lignin-containing secondary cell and cellulose-based primary cell wall, puts in sides and ends of cell (no secondary cell here)
