PlantsandEnvironmentalFactorsLesson3MAINROOTLATERALORSIDEROOTROOTSYSTEMLEAFSTEMFLOWERFRUITNODENODENODEINTER-NODETERMINALBUDAXILLARYBUDSHOOTSYSTEMWhatarethestructuraldifferencesbetweendicotandmonocotstems?•Monocots–Oneseedleaf–Parallelveinsinleaf–Xylemandphloemfoundinbundlesinstem•Dicots–Producetwoseedleaves–Branchedleafveinsystem–XylemandphloemcellslocatedinseparateareasofthestemWhatarethefunctionsofroots?•Whitishortanincolor•Makeupone-halformoreoftheentireplantbody•Absorbwaterandnutrientsfromthesoilthentransportthemaboveground•Servetoanchorandsupportthetopportiononplant•CanstorecarbohydratestobeusedlaterforenergybyplantWhatarethepartsofarootsystem?•Primaryroot-firststructuretoemergefromgerminatingseed•Secondaryroot-arisesfromtheprimaryroot–Don’ttransplantseedlingsorcuttingsuntilaftersecondaryrootforms•Roothairs-singlecellrootslocatedafewmmbackfromroottip,absorbwater•Rootcap-massofcellsthatprotectsroottipsfromcoarsesoilWhatarethedifferencesbetweentaprootandfibrousrootsystems?•Taproot–Onelargeprimaryrootthatgrowsdown+smallsecondaryroots•Fibrousroot–Rootdevelopsintoanumberofsmallprimaryandsecondaryroots•Growshallownearthesoilline•Subjectedtodroughtandmineraldeficiencies•MostlandscapeplantsWhataremodifiedroots?•Adventitiousroots(不定根)–Begingrowingfromstemorleaf–GrowfromcuttingsafterbeingplacedingrowingmediumPlantattachesitselftotreebranchortelephonewireRootshangdowninmid-airandabsorbwaterfromrainfallBanyantree（印度榕树）Schefflerabonsai（鹅掌藤）Examples:WildPine;SomeOrchidsPROPROOTSe.g.CornSTILT（支柱）ROOTSe.g.Mangrove红树Aeratingroot（呼吸根，通气根）FlowerWherearethereproductivestructuresofplantsandhowdotheywork?•Sepals-greenleaf-likestructuresunderthepetals•Petals-brightlycoloredstructuresonflowerusedtoattractpollinators•Stamens-malereproductivepartscontainingfilamentandanthersurroundingfemaleparts–Filament-stalkthatsupportsanther–Anther-producespollenormalesexcells•Pistils-femalereproductivepartscontainingstigma,style,ando...
