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1、Unit4ExploringplantsPartTwo:TeachingResourcesSection1:DiscoursestudiesofPLANTEXPLORATIONINTHE18THAND19THCENTURIES1.TypeofwritingandsummaryofPLANTEXPLORATIONINTHE18THAND19THCENTURIESTitleoftextPLANTEXPLORATIONINTHE18THANDI9THCENTURIESTypeofwritingExposition2・Adiag
2、ramofPLANTEXPLORATIONINTHE18THAND19THCENTURIESUnit4ExploringplantsPartTwo:TeachingResourcesSection2:BackgroundinformationforUnit4Exploringplants1.ImportanceofPlantsPlantsformthebasicfoodstapleforalllifeforms.Theyarethemajorsourceoffoodandoxygenonearth,sincenoanim
3、alcansupplythesenecessarycomponentswithoutplants.Thecattleweeatasbeef,feedongrassesandthefishweeat,consumealgaeandarethereforedependentonplantsforwellbeing・Otherimportantusesofplantsinclude,providingshelterforanimals,providingmaterialsforclothing(cottonfibers),pa
4、perproducts,medicinesandotherchemicals,producingcoalfromoncelivingplantmaterial,reducingwindspeedandnoiselevels,andreducingsoilerosionandwaterrunoff.Therearemanydifferenttypesofcashcropsthatproducemoneyforfarmers.Oliveoilcomesfromolives,cornoilcomesfromcorn,andpe
5、anutoilcomesfrompeanuts.Typicalagriculturalproductslikecorn,wheat,rye,andriceareallconsideredcashcrops・Coffeeplantsproducebeansthatareusedtomakecoffee;cocaplantsgiveuschocolate;vanillaplantsgrowlongthinbeansthatareusedtoproducevanillaflavoring.Manydrinksandbevera
6、ges,likecolaandtea,comefromplants・Rubberfromtreesisalsoacashcrop,asislumber,fruit,vegetables,andcotton.Plantsarealsousedinagriculturetohelpreducewindspeed.Plantingtreesinarowpreventsthewindfromblowingawaythevaluabletopsoil・Intheforest,treesactasshelterformanyorga
7、nisms.Plantsarealsoimportantfortheoverallecologyofanarea.Rootshelptostabilizesoilandpreventerosionbywaterrunoff(soilconservation).Plantsarealsoimportantinouratmospherebecausetheyusecarbondioxideandgiveoffoxygenwhiletheyundergophotosynthesis.Plantsarealsousedinthe
8、urbansettingtoreducenoise,produceshade,andtobeautifyanarea.Treesaddvaluetohomesandcommunities.Plantsareessentialtothebalanceofnatureandinpeople'slives・Greenpla
