Slide 1Slide 2Slide 3Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12Slide 13Slide 14Slide 15Slide 16Slide 17Slide 18Slide 19Slide 20Slide 21Slide 22Slide 23Slide 24Slide 25Slide 26Slide 27Slide 28Slide 29Slide 30Slide 31Slide 32Slide 33Slide 34Slide 35Slide 36Slide 37Slide 38Exam #2 M 3/8 in classQ&A Fri. 3/5 from 4-6pm in WRW 102Plants grow and reproduce, as well as, respond to the environment.Plants grow and reproduce, respond to the environment… today- transportTypes of Plant Cells:defined by function and cell wallFig 6.9Plant cell walls are mostly made of celluloseCellulose is made of glucoseFig 5.7Fig 5.8Cellulose is made of glucoseFig 5.9Only a few prokaryotes and fungi can digest celluloseCell walls contain cellulose, pectins, proteins...Fig 35.1060 m Parenchyma cells- most common cells; primary cell wallsFig 35.17Parenchyma in a stemFig35.10Collenchyma cells- unevenly thickened cell walls; flexible support80 mCollenchyma in a leafSclerenchyma cells- Thickened secondary walls (inside primary wall); with lignin; rigid5 m 25 m Fig 35.10Fig 35.10Water conducting cells of Xylem: vesselsandtracheids(types of sclerenchyma)100 mSugar conducting cells of Phloem: sieve-tubes and companion cells15 m 30 m Fig 35.10Fig 36.2Plants transport water in xylem, sugar in phloem, plus minerals and hormones…Fig 36.2Water travels from ground out through stomata via xylemFig 36.2The exit of water through stomata is accompanied by gas exchangeFig 36.2Sunlight powers photosynthesis and these sugars are transported via phloemFig 36.20Phloem transport is from source to sink.Fig 36.20Sugar is loaded at sources and unloaded at sinks...consuming ATPsource:leafsink:root, flower, emerging leaf etc…Source and sink locations vary...The direction of Phloem transport is versatile.Fig 36.10Much of plant support comes from turgor pressure.CB 36.15Water moves from the ground through roots into the shoot and out stomata in the leaves.Fig 35.13In roots the vascular bundle is in the centerFig 36.11Plant cell to cell transport can occur by two pathways: symplastic and apoplasticplasmodesmataFig 36.12The casparian strip of the endodermis keeps water from entering the xylem via a purely apoplastic route.What moves the water through the xylem?Stomata control entry of CO2 and exit of H2O from plant leavesStomataFig 36.14Stomata on the underside of a leafFig 36.17Guard cell opening is regulated by turgorFig 36.15What moves the water through the xylem?Transpiration, Adhesion, Cohesion, andTensionwater transport limits plant growthxylemphloemMore xylem is needed for more water transport: secondary growthxylemphloemXylem is tough, and full of lignin- inhibits the ability to use plants to produce biofuelsExam #2 M 3/8 in classQ&A Fri. 3/5 from 4-6pm in WRW
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