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MSU - BIOL 1144 - Biology 2 week 10 - Class Notes

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MSU - BIOL 1144 - Biology 2 week 10 - Class Notes

School: Mississippi State University
Department: Biology
Course: Biology II
Professor: Thomas Holder
Term: Spring 2015
Tags:
Name: Biology 2 week 10
Description: Exam two notes!
Uploaded: 02/26/2019
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Join more than 18,000+ college students at Mississippi State University who use StudySoup to get ahead
School: Mississippi State University
Department: Biology
Course: Biology II
Professor: Thomas Holder
Term: Spring 2015
Tags:
Name: Biology 2 week 10
Description: Exam two notes!
Uploaded: 02/26/2019
2 Pages 43 Views 34 Unlocks
  • Better Grades Guarantee
  • 24/7 Homework help
  • Notes, Study Guides, Flashcards + More!

Unformatted text preview: Stomatol Fonds produce waxy cuticle to prevent water loss Facilitates gas exchange -90% of water is lost through Stomata { co, diffuses in when stomata Oz water vape are released is open Mechanism for Guard cells Daytime sun -(023 law in ledt Guard cells 'pump in' K - changes sulute concentration "pumping requires expending ATP Moves by osmosis into guard cell (turgid) H2O The fusion in) (102 diffusiun in) Guard cell swell Gopen stomata pump out ki Ho moves by usmosis out of gouard cells causing Shrinking water loss causes: - Sunlight energy beats leaf i evaporation ONS Causes decrease in Ho concentration, causing a pull' of H2O Pull moves watter through 'Transpivatich stredinta Transpiration stream koot epidermis proof cortex to endodermis to poot Xylo-* stem xylem mecophyll - Vapor into atmosphere through Stomata -Soil. H2O leaf xylemC-A - T Mechanism - When Stomater opens, pure physical process Kundirecional flow - 'pull' of H20 one mokwie @ atime * transpiration - evav poranin coneston ; H20 Molewles stock together Adhesion Hou adheres to cellulose in walls tensions' pull due to itzu 1055 from mcsophyll -No energy expanded; only energy is sun bearing leaf solute movement "Translocation movement of solutes in plants - food: dissolved in Hz0, moved in form of sucrose Gink p Site where food or solute - Bidirectional flow - Movement of food : Source + Sink needed undlivethinal Similarites & Transplrahon & translucent in oboth involve conduction "Both involve physical properties of H2O Translocation Translocation sunlight energy (no expendeature) xylem Phlyen bidirectional 'must expend atp energy by plant Long Distance transport in Athluem they are produced /or stored to other transports sugars from where phloem * Sites were they aree used /needed [Source Pink - Primory phlo : ocars in bundles of her baceous plants Secondary phloem: OCCURS in inner bark of woody Wants on Back ...concentration Pressure Flow Hypothesis - At Source : "companion cells pump the sucluse into STMS (ATP expenditure) - pump requires this ATP As sucrose concentration increases, water potential decreases win SIMS has higher water potential than SIM; H20 moves into Xylem . adjakent xylem has higher No SIMS by Osmosis Sucrose will be moved by bulk flow (high olon pressure) -AT sink : companion cell unload sucrose (requires atp expenditure) Sucrose converted to starch folta storage in hour cortex o w/out sucrose, higher H20 potential in SIMS H20 moves from STM to adjacent xylem by as musis -ATP spont only companion cells @ source clooding) & sink unloading) - BULK fluw (pressure I potential differences) e asmosis (H20 potential concentrational NO cha gu expenditure Overview: Flowering Plant Repro - Flowering pants undergo alternation of generations 2 multicell life cycle stages Diploid., sp e producing sporophyte - merosis Haploid, gamete producing gametuhyte Mitosis

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