Documents

10.3.14 lecture 1

Description
bio 20b
Categories
Published
of 2
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Related Documents
Share
Transcript
  10/3/14Photosynthesis: bridge between plants and biological worldObjectives:1.How is plant diversity organized! ajor gro#ps: sto$ata% vasc#lar% seeds% &lowers −  'onvasc#lar plants: no transport syste$ − (ater and n#trients di&&#se into cells − sper$ has to swi$ to eggs −  places li$its on plant growth and habitats )e*. +iverworts, − -asc#lar plants )vasc#lar  allowed plants to get tall, − ransport syste$ &or water and n#trients − tall branching plants &or &irst ti$e )vs. $oss plants, − Proli&eration o& plant!eating ani$als and srcins o& coal &ields − Plants had carbon being developed − eed plants: evol#tion o& seeds and woods − woody growth allows even taller plants )s#pport, − no longer re#ired water &or &ertilization )#sed pollen instead o& sper$, − e$bryos protected in seeds − 2lowers and &r#its: )angiosper$s  enclosed seeds, − 2ood provides e*tra n#trients &or e$bryos and new ways &or e$bryos to get aro#nd − co!evolving with nai$als − diversi&ication o& ani$als: these plants lead to ani$als with higher $etabolic rates-asc#lar: eeds: gy$nosper$s )naed seeds, angiosper$s )&lowers/&r#its, 5 seedless6.Plants have a $od#lar body plan!hoot syste$/root syste$!hoot syste$: repeating $od#les o& nodes% internodes% b#ds!root syste$: repeated branches − How does the body plan o& a plant develop − 1. which way is #p − 7neven cell division ca#ses one cell to have less cytoplas$ − apical!basal polarity − )apical: top cell% s$aller than the basal cell )botto$ cell, − 6. where do tiss#es go − recap: plants have a $od#lar body plan. 8t the end o& the e$bryo vessels: − 1. apical!basal a*is established − 6. radical a*is established − 3. root/shot apical $eriste$s estab − 4. plant tiss#es di&&erentiate3. eriste$s allows contin#o#s plant growth! gro#p o& #ndi&&erentiated cells divide% gives rise to new tiss#es and organs )contin#o#s plant growth! apical $eriste$s allows shoots and roots to lengthen% )pri$ary growth,! lateral $eriste$ 5 allows plants to get thicer )econdary growth,  4. plant &#nction relies on three tiss#e syste$s1. der$al: o#ter covering o& plant )epider$is,! barrier between plant and o#tside world: de&ense% attraction )gives color to &lowers,% and gas e*change! epider$#s #s#ally a single cell layer  − $ainly s$all ro#n dcells − secrets a wa*y protective c#ticle − sto$a: pore in epider$#s o& plant cell 5 allows change o& gas − tricho$es: lea& hairs − root hairs: increases s#r&ace area to #ptae water 6. gro#nd: $ost o& plant body: storage% s#pport% photosynthesis! between der$al and vasc#lar tiss#e! 3 $ain types o& cells:1.Parenchy$a tiss#es: living at $at#rity! thin cell walls% large central vac#ole% photosynthesis% storage% wo#nd healing% ase*#al prod#ction6.collenchy$a tiss#e! living at $at#rity%irreg#larly thicened cell walls )provides &le*ibility and s#pport,% s#pports actively growing tiss#es3.scierenchy$a tiss#es: $ade o& &ibers and sclereids! dead at $at#rity% thic secondaryh walls rein&orced with lignin − &ibers: long% sinny% and pacaged into b#ndles to provide rigid s#pport − sciereids are ro#nd and $ae #p hard s#r&aces ) n#t shells, 3. vasc#lar: pl#$bing% transport water and n#trients &ro$ rots to ste$. oves s#gar to rest o& the plant.wo types o& str#ct#res: *yle$ and phloe$6. *yle$: transports water and $ineral ions! tracheary ele$ents: cond#cting cells o& *yle$1.trachids: tapered at end and b#ndled together. )'o holes% water  passes thro#gh pores,6.vessel ele$ents: long t#blar cells opened at both ends/ arranged end to end &or$ing vessels that &#nction lie water pipes6. Phloe$: transports s#gars &ro$ prod#ction sites to storage/#sage sites − alive at $at#rity − end o& walls have plas$odes pores − connects end to end )sieves, − co$panion cells acts as li&e s#pport syste$s
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks