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 water system Journey of evolution - to land estate changed from tropical - to seasons (hot cold, dry, wet) Further borrowing to land -climate Bryophytes         Mosses, Liverwort, etc. atomic number 18 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 for the first time; non vascular plants came as a start Characteristic of Bryophytes         Non vascular plant          fool no veins (vascular tissue)         No roots for cleverness of the soil         Are small          overlook support to adhere big         Parts mostly stay pissed the understanding         So they can get water and nutrients Other characteristics                  No surgery stomata (pores)         They have little control over water loss          fuddle little or no scale         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 die hard out (damping off is a fungus decease) Also used as fuel         Grows very fast         Does not root          dramatis personae mats many feet thick         Make bricks -burn good         Better than woodwind         Worse than coal Trends in plant evolution 1.          separate vascular tissue a.         xylems=veins in plants         Carries water         Dissolves-nutrients (N, P, K ) b.

        most original 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 rivalry 3.         Secondary Growth Growth in diameter (girth) through and through adding layers of xylem         They grow taller         Persist form season to season          practise from season... If you want to get a full essay, order it on our website: OrderEssay.net

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