Lecture Notes -- History of Plants Bio104/download word document for ease of reading.

HISTORY OF PLANTS 470 Mill years ago Evidence sheets of moss on rocks and the edge of pee Journey of evolution - to land earthly concern changed from tropical - to seasons (hot cold, dry, wet) Further acceptation to land -climate Bryophytes         Mosses, Liverwort, etc. are utilise as examples of plants without most current evolutionary adoption But: they are non the crude(a) ancestors of other plants NOTE: vascular plants came source; non vascular plants came as a section Characteristic of Bryophytes         Non vascular plant          fool no veins (vascular tissue)         No roots for penetration of the soil         Are small          overlook support to drop dead big         Parts mostly stay pissed the commonwealth         So they can get water and nutrients Other characteristics                  No surgery stomata (p ores)         They have little control over water loss          fuddle little or no plate         Reproduces via spores (not seeds)         Have flagellated sperm NOTE: Peat Moss Genus-          Sphagnum-comes from Canada         Agriculture- used as soil additive - retains moisture         Is acidic - prevents seeds form damping draw out (damping off is a fungus decease) Also used as fuel         Grows very fast         Does not root          rebound mats many feet thick         Make bricks -burn good         Better than timberland         Worse than coal Trends in plant evolution 1.          give way vascular tissue a.         xylems=veins in plants         Carries water         Dissolves-nutrients (N, P, K) b.         mos t indigenous xylem are called tracheids Is ! made out of dead cells c.         advanced xylem -(mixture ofttimes vessel elements)         Occurring in seed plants-gymnosperm (no flowering seed plants)         Has a vessel element 2.         Unequal branching a.         Earliest vascular plant - no branch b.         Then two branch c.         Then dicatomous branch-equal branching d.         Unequal branching         Get long-shanked faster         More efficiently in food contestation 3.         Secondary Growth Growth in diameter (girth) with adding layers of xylem         They grow taller         Persist form season to season          go after from season... If you want to get a full essay, order it on our website: OrderEssay.net
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