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Becauseplantscannotmoveortalk,mostpeoplebelievethattheyhavenofeelingsandthattheycannotreceivesignalsfromoutside.However,thismaynotbecompletelytrue.Peoplewhostudiedplantshavefoundoutthatplantscarryasmallele
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更新时间:2024-04-26 05:42:36
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Becauseplantscannotmoveortalk,mostpeoplebelievethattheyhavenofeelingsandthattheycannotreceivesignalsfromoutside.However,thismaynotbecompletelytrue.
Peoplewhostudiedplantshavefoundoutthatplantscarryasmallelectricalcharge(电荷).Itispossibletomeasurethischargewithasmallpieceofequipmentcalled“galvanometer”.Thegalvanometerisplacedonaleafofftheplant,anditrecordsanychangesintheelectricalfieldoftheleaf.Humanshaveasimilarfieldwhichcanchangewhenweareshockedorfrightened.
AmancalledBacksterusedagalvanometerforhisstudiesofplantsandwasverysurprisedathisresults.Hefoundthatifhehadtwoormoreplantsinaroomandhebegantodestroyoneofthem-perhapsbypullingoffitsleavesorbypullingitoutofitspot-thenthegalvanometerontheleavesoftheotherplantsshowedachangeintheelectricalfield.Itseemedasiftheplantsweresignallingafeelingofshock.ThishappenednotonlywhenBacksterstartedtodestroyplants,butalsowhenhedestroyedotherlivingthingssuchasinsects(昆虫).
Backstersaidthattheplantsalsoknewifsomeonehaddestroyedalivingthingsomedistanceaway,becausetheysignalledwhenamanwhohadjustcutdownatreeenteredtheroom.
Anotherscientist,namedSauvin,achievedsimilarresultstoBackster’s.Hekeptgalvanometersfixedtohisplantsallthetimeandcheckedregularlytoseewhattheplantsweredoing.Ifhewasoutoftheoffice,hetelephonedtofindoutaboutthesignalstheplantsweresending.Inthisway,hefoundthattheplantsweresendingoutsignalsattheexacttimeswhenhefeltstrongpleasureorpain.Infact,Sauvincouldcauseachangeintheelectricalfieldofhisplantsoveradistanceofafewmilessimplybythinkingaboutthem.
小题1:Backsterwassurprisedattheresultsofhisstudiesbecause_____.

A.hedestroyedaninsect
B.hedestroyedaplantbypullingoffitsleaves
C.hefoundthatplantscouldexpressfeelingsofshock
D.hefoundthatplantscouldmoveandspeakafterall
小题2:Theplantssentoutsignals_____.A.onlywhenBacksterStartedtodestroyplantsB.whenBacksterdestroyedplantsorot

刘会兵回答:
  小题1:C小题2:B小题3:D小题4:C   
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