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Plant Diversity I - Plant Diversity I The Colonization of...

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P lant D iversity I : T he C olonization of L and C am pbe C am pbe ll, 5 ll, 5 th th  Edition, Chapter 29  Edition, Chapter 29 Nancy G. Morris Nancy G. Morris Volunteer Volunteer     State Community College State Community College
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Figure 29.3 Highlights of Plant Evolution
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Review of Characteristics: Review of Characteristics: Chloroplasts  with photosynthetic pigments:    chlorophyll a, chlorophyll b, carotenoids Cell walls containing  cellulose Secondary cell walls containing  lignin Food stored as  amylose  in plastids Classification of Kingdom (Table 29.1)
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Plant Kingdom Me m be rs  s ho w s truc tural , c he m ic al , &  re pro duc tive  adaptatio ns  o f te rre s trial life   This  dis ting uis he s  hig he r plants  fro m  the   aq uatic  alg ae Structural adaptation  inc lude s  s pe c ialize d  s truc ture s  to  o btain wate r, m ine rals , c arbo n  dio xide , lig ht, e tc . Example:   stomata  – s pe c ial po re s  o n  s urfac e  fo r g as  e xc hang e
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Plant Kingdom Chemical adaptation  inc lude s  a waxy c utic le ,  c o m po s e d o f  cutin ,  to  pre ve nt de s ic c atio n  Cutin lignin sporopollenin  are  e xam ple s  o f  s e c o ndary pro duc ts  m e aning  that the y are   pro duc e d thro ug h m e tabo lic  pathways  no t  c o m m o n to  all plants cellulose  is  an e xam ple  o f a  primary product
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Plants as Embryophytes A new mode of reproduction was necessary to move  from an aquatic to terrestrial existence: 1) Gametes are produced in  gametangia , o rg ans   with pro te c tive  jac ke ts  o f s te rile  c e lls  that  pre ve nt g am e te s  fro m  drying  o ut.  Eg g  is   fe rtilize d within the  fe m ale  o rg an.                                                   Fig ure  29.1a
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Plants as Embryophytes 2)  Embryos must be protected against desiccation.   Zygote develops into embryo that is retained within  female protective cells in the gametangia         Figure  29.1b
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