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PlantTissuesTopic7Part2
ComplexTissue:DermalTissueEpidermisUsuallyasingleouterlayerofcellsthatsecreteawaxy,protectivecuticleMaycontainspecializedcellsthatformstomataforgasexchange
PlantCuticle
SimpleTissuesParenchymamakesupmostprimarygrowthFunctionsinsecretion,storage,photosynthesis(mesophyll),andtissuerepairCollenchymasupportsgrowingplantpartsDepositofcelluloseatthecornersofthecells.SclerenchymacontainsligninforsupportCells(fibers,sclereids)aredeadatmaturity
SimpleTissues
collenchymaparenchyma
lignifiedsecondarywall
Mesophyll–PhotosyntheticGroundTissueMesophyllPhotosyntheticparenchymawithairspacesbetweencellsCarbondioxidediffusesinandoxygendiffusesoutthroughstomataPlasmodesmataconnectadjacentcellsSinglelayerofcells(inmonocots)ordoublelayer(palisadeandspongymesophyll)
leafvein(onevascularbundle)cuticlexylemphloemupperepidermispalisademesophyllWater,dissolvedmineralionsfromrootsandstemsmoveintoleafvein(bluearrow).spongymesophylllowerepidermisPhotosyntheticproducts(pinkarrow)entervein,willbedistributedthroughplant.epidermalcellOxygenandwatervapor(bluearrow)diffuseoutofleafthroughstomata.Carbondioxide(pinkarrow)inoutsideairdiffusesintoleafthroughstomata.stoma(smallgapacrosslowerepidermis)
vascularcylinderendodermisprimaryphloemprimaryxylemcortexThisisalayerofcells,onetoseveralcellsthick,justinsidetheendodermisandnexttovasculartissue.Inroots,itisonecellthickandnewrootsgrowfromthislayer.pericyclePericycle
ComplexTissues:VascularTissuesXylemcarrieswaterandionsthroughtheplantConsistsoftwotypesofcellsthataredeadatmaturity:tracheidsandvesselmembersLignin-filledsecondarywalls Phloemconductssugars,otherorganicsolutesSievetubesconnectendtoendatsieveplatesCompanioncellsloadsugarsintosievetubes
VascularTissues
TissuesinaButtercupStem
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