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 urine Journey of evolution - to land Earth changed from tropical - to seasons (hot cold, dry, wet) Further adoption to land -climate Bryophytes         Mosses, Liverwort, etc. be put on as examples of whole workss without most stream evolutionary adoption But: they ar non the crude(a) ancestors of other plants NOTE: vascular plants came first; non vascular plants came as a branch Characteristic of Bryophytes         Non vascular plant          fool no veins (vascular tissue)         No roots for penetration of the de inventity         Are small          overlook support to convey big         Parts mostly baulk pissed the ground         So they open fire get water and nutrients Other characteristics                  No surgery stomata (pores)         They have diminutive control over water loss          fuddle little or no cuticle         Reproduces via spores (not seeds)         Have scourge sperm NOTE: Peat Moss Genus-          Sphagnum-comes from Canada         Agriculture- used as soil additive - retains moisture         Is acidic - prevents seeds realise damping move out (damping off-key is a fungus decease) Also used as fuel         Grows very fast         Does not root          piss mats many feet thick         Make bricks -burn good          mitigate than wood         Worse than coal Trends in plant evolution 1.         better vascular tissue a.         xylems=veins in plants         Carries water         Dissolves-nutrients (N, P, K) b.

        most primitive xylem are called tracheids Is made out of suddenly cells c.         advanced xylem -(mixture much vas elements)         Occurring in seed plants-gymnosperm (no flowering seed plants)         Has a vessel element 2.          unsymmetrical branching a.         Earliest vascular plant - no branch b.          and then two branch c.         Then dicatomous branch-equal branching d.         Unequal branching         Get long-shanked faster          more efficiently in feed competition 3.         Secondary Growth Growth in diameter (girth) Through adding layers of xylem         They grow taller         Persist form season to season          succeed from season... If you involve to get a respectable essay, order it on our website: Orderessay

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