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 a m pb e C a m pb e 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 b e rs  s ho w s truc tura l , c he m ic a l re pro duc tive  a da pta tio ns  o f te rre s tria l life   This  dis ting uis he s  hig he r pla nts  fro m  the   a q ua tic  a lg a e Structural adaptation  inc lude s  s pe c ia lize d  s truc ture s  to  o b ta in wa te r, m ine ra ls , c a rb o n  dio xide , lig ht, e tc . Example:   stomata  – s pe c ia l po re s  o n  s urfa c e  fo r g a s  e xc ha ng e
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Plant Kingdom Chemical adaptation  inc lude s  a  wa xy c utic le ,  c o m po s e d o f  cutin ,  to  pre ve nt de s ic c a tio n  Cutin lignin sporopollenin  a re  e xa m ple s  o f  s e c o nda ry pro duc ts  m e a ning  tha t the y a re   pro duc e d thro ug h m e ta b o lic  pa thwa ys  no t  c o m m o n to  a ll pla nts cellulose  is  a n e xa m 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 a ns   with pro te c tive  ja c ke ts  o f s te rile  c e lls  tha t  pre ve nt g a m e te s  fro m  drying  o ut.  Eg g  is   fe rtilize d within the  fe m a le  o rg a n.                                                   Fig ure  29.1a
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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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This note was uploaded on 01/30/2012 for the course CHEMISTRY 1a taught by Professor Nitsche during the Fall '11 term at Southwestern.

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

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