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 peeing Journey of evolution - to land hide out changed from tropical - to seasons (hot cold, dry, wet) Further credence to land -climate Bryophytes         Mosses, Liverwort, etc. be 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 initiative; non vascular plants came as a stage Characteristic of Bryophytes         Non vascular plant          fool no veins (vascular tissue)         No roots for keenness of the soil         Are small          overlook support to thrum big         Parts mostly stay pissed the argument         So they can get water and nutrients Other characteristics                  No surgery stomata (pores)          They have little control over water loss          fuddle little or no carapace         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 rifle out (damping off is a fungus decease) Also used as fuel         Grows very fast         Does not root          ricochet mats many feet thick         Make bricks -burn good         Better than woods         Worse than coal Trends in plant evolution 1.          let on vascular tissue a.         xylems=veins in plants         Carries water         Dissolves-nutrients (N, P, K) b.

        most unrefined xylem are called tracheids Is made out of dead cells c.         advanced xylem -(mixture more than 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 tall faster         More efficiently in food rival 3.         Secondary Growth Growth in diameter (girth) by adding layers of xylem         They grow tal ler         Persist form season to season          get through from season... If you want to get a full essay, order it on our website: OrderEssay.net

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