植物学及园艺学 英文版 botany and horticulture课件.ppt

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1、Unit1Section4:CellsandPhotosynthesis4.1IntroductiontoPhotosynthesisPhotosynthesisisaseriesofenzyme-controlledreactionswhichallowgreenplantstomaketheirownfood.Revision–Structureofaleaf4.1GreenPlantsasProducersProducersaregreenplantswhichcanmakefoodbyphotosynthesis.Carbohydratesaremoleculescontain

2、ingcarbon,hydrogenandoxygenmadebyphotosynthesis.Photosynthesisisaprocessinwhichgreenplantsmakefoodfromrawmaterialsusingenergyfromsunlight.4.1NeedforLightBycoveringpartofaleafwithcardboardfor24hoursandthentestingtheleafforstarch,itcanbeshownthatsunlightisthesourceofenergyusedbytheplanttoproducest

3、archbyphotosynthesis.Since,onlythepartsoftheleafexposedtosunlightturnedblackwhentestedwithiodinesolution.4.1TestingaleafforstarchTheleafsampleistransferredtoalcoholandheatedbythewarmwaterforafewminutes.Thisremovesthechlorophyll.Theleafsampleisrinsedinthewatertoremovethealcoholandsoftenit.IodineT

4、heleafisplacedinadimpletileandafewdropsofiodineadded.Ifstarchispresentitwillturnblue/black.Leafsamplesareboiledinwaterfor2minutes,tobreakopenthecellwalls.4.2TheRoleofChlorophyllChlorophyllisonlypresentinthegreenpartsofavariegatedleaves(shownabove).Chlorophyllisagreenpigmentfoundinthechloroplasts

5、ofplantcells.Lightenergyfromthesunistrappedbychlorophyll.4.2ChloroplastschloroplastChloroplastsarefoundinthecytoplasmofgreenplantcells.4.2CaptureofLightEnergybyChlorophyllLightenergyfromtheSunChemicalenergyincarbohydrateschlorophyll4.3NeedforCarbonDioxidepotassiumhydroxidesodiumbicarbonatePlantA

6、PlantB4.3SummaryEquationforphotosynthesisConditionsneededRawmaterialsProductslightcarbondioxideglucosechlorophyllwateroxygen4.4PhotolysisStagePhotolysisistheprocessbywhichenergyfromsunlightisusedtosplitwatermoleculesintohydrogenandoxygen.releasedintoairpassedto2ndstage4.4PhotolysisStagelightener

7、gychlorophyllchemicalenergyADP+PiATPwaterhydrogenoxygen+passedto2ndstage4.4EvidenceforPhotolysishydrogenDCPIPDCPIPTheindicatorDCPIPcanbeusedtoshowthesplittingofwatermoleculestoproducehydrogen.Inthepresenceofhydrogen,DCPIPwil