英文教学课件——植物的世界(植物介绍、植物培育、食物制作)

TheWorldofPlants英文教学课件——植物的世界（植物介绍、植物培育、制作食物）WorldofPlantsisdividedinto:A-IntroducingplantsB-Growingplants(Pollination,Fertilisation,Asexualreproduction)C-MakingfoodPlants-thefirstlinkPlantsarethelinkbetweentheenergyinthesunbeingconvertedintoaformwhichanimalscaneatandgettheenergytosurvive…WorkbookActivityp54FoodwebsandplantsTheprocessbywhichplantsdothisiscalled:PhotosynthesisAlllivingthingsrespireallthetimetoreleaseenergyfromtheirfoodinaprocesscalled:RespirationPlantsurvivalPlantsmaketheirownfood,glucose,byphotosynthesis.Itonlyhappensduringthedaytimewhenthereislightavailable.Thishappensinplantcellscontainingthechemicalchlorophyll(green-coloured)whichtrapsthelightenergy.Theplantshavecapturedlightenergyandturneditintoastoreofchemicalenergy(glucose).RawmaterialsProductscarbondioxide+waterglucose+oxygenchlorophyllMoreontheusesforglucoseshortly…Islightneededforphotosynthesis?1.Takeade-starchedgeraniumplant(24hindark).2.Coverpartofaleafwithsometinfoil(thispreventslightgettingthrough).3.Leavetheplantinsunlightforafewhours.4.Testtheleafforstarch.Iscarbondioxideneededforphotosynthesis?1.Takeade-starchedgeraniumplant2.Encloseitinaplasticbagwithachemicalthatabsorbscarbondioxide.(e.g.sodalimeorsodiumhydroxidepellets).3.Leavetheplantinsunlightforacoupleofhours.4.Testtheleafforstarch.Questions:1.Whichpartsoftheleafdoyouthinkwillgoblue-black?2.Whydopartsthatwerenotcoveredcontainstarch?Islightneededforphotosynthesis?WorkbookProblemSolvingp81MakingastarchprintIscarbondioxideneededforphotosynthesis?Questions:1.Doestheleafcontainstarch?Why/whynot?2.Hastheplantcarriedoutphotosynthesis?3.Whatwouldbeyourcontrolplant’sconditions?(Hint:acontrolplantshouldhaveeverythingitneedsforphotosynthesisincludingcarbondioxide).WorkbookProblemSolvingp76PlantsandgreenhousesCO2isconvertedintoglucosebyphotosynthesis.Mans’usesofplantglucosePlants’usesofplantglucoseGlucoseUsedimmediatelytoprovideenergysourceforrespirationEnergyusedtoturnsugars,nitrates&othernutrientsintoaminoacidswhichbuildupproteinsTomakecellulose,themainstructuralmaterialincellwallsRawmaterialforgrowth,repairandreplacementofdamagedpartsEnergystoredasstarch(inleaves,seeds,rootsandtubers)Tomakefats&oils(energystoredinseeds)Energystoredassucrose(infruit)GlucosemoleculeWorkbookActivityp70ChangesincarbohydrateActivity–Testingaplantforsugar1.Putapieceofrawonioninapestleandmortar.2.Grinditwithalittlesandand10cm3ofwater.3.Filtertheliquidintoatesttube4.Heattheliquidwith10dropsBenedict’ssolutioninawaterbatha)Whatcolourchangewouldyouexpectifsugarwaspresent?b)Writeanexplanationofyourresults.Youneedtoknowtheplantexperimentsindetail,explainthedifferentsteps,andresults,ineachone.Activity-Testingaleafforstarch1.Dipaleafintoboilingwaterforaboutaminute(tosoftenit).2.TurnofftheBunsenburner.3.Puttheleafintoatest-tubeofethanol(toremovechlorophyll).4.Standthetest-tubeinabeakerofhotwaterforabout10minutes.5.Washtheleafincoldwater.6.Spreadtheleafoutflatonapetridishandcoveritwithiodinesolution(testsforstarch).7.Iftheleafgoesblue-black,starchispresent.Activity-TestingaleafforchlorophyllRepeatthestarchtestbutthistimeuseavariegatedleaffromageraniumplant.Variegatedmeansthataplanthascolouredandwhitepartsonitsleaves.Dothegreenpartscontainchlorophyll?Dothewhitebits?Whichdoyouthinkwilltestpositiveforstarch?Fromlittleacornsdogreatoaksgrow…Wheredotheextra250kgcomefrom?Explainyouranswerasfullyandscientificallyasyoucan.Atreeisplantedinameadow.After20yearsithasgrownintoabigtree,weighing250kgmorethanwhenitwasplanted.GasBalanceDuringtheday:Oxygenreleasedbyphotosynthesisisgreaterthantheamountofoxygenusedupinrespiration.CO2usedinphotosynthesisisgreaterthantheamountofCO2producedbyrespiration.glucose+oxygencarbondioxide(CO2)+watercarbondioxide+waterglucose+oxygenallthetimedaylightonlyFillajarwithwater.Fillatesttubewithwatertooandcoverthetopasyouplaceitupsidedowninsidethejar.Takearunnerandfeeditupinsidethetesttube.LeaveindirectsunlightforafewhoursResult?AbubbleofoxygengasshouldformatthetopofthetesttubeasitphotosynthesisesSummaryofPhotosynthesisWorkbookActivityp64-65ElodeabubblerexptPlants’wasteproduct-oxygen-isessentialforanimallife.QuickQuiz11.Whatdoesaplantneedforphotosynthesis?2.Whatdoesaleafproduceduringphotosynthesis?3.Whatischlorophyll?4.Howdotheleavesobtainwater?5.Howdoestheplantobtaincarbondioxide?6.List3usesoftheglucoseproducedbyphotosynthesis?7.Namethestorageformofcarbohydrateinaleaf.Carbondioxide,water,chlorophyll,light.Oxygen,glucoseAgreenpigmentwhichabsorbsthesun’senergyThroughtheroots(andxylemtubesbyosmosisFromtheair(throughstomata)Cellulose(structural),starch(storage),energyStarch.AleafintimeLibraryactivitySource:://…Leavesaretheorgansofphotosynthesisandmakeallthefoodforaplant.Wewilllookat:Outerlayers(top&bottom)Innerstructureincludingveins(itstransportsystem)InternalstructureCollectthehandout‘Leafstructure’andaddlabels/notes.mes