高中英语人教版选修九同步课件U4P4Workbookreadingtask

Unit4Discussthequestion:What’stherelationshipbetweenplantsandanimals?Co–Evolutionyucca丝兰yuccamothTheTraveller’sPalm棕榈树TheMadagascarblacklemurTheOphrysOrchid兰花wasp1.What’sthetopicofthetext?2.Whatthreeplantsarefeatured?3.Whatdothephotosshowyou?4.Whatthreeanimalpollinatorsarefeatured?Beforeyoureadthetext,glancequicklythroughitandanswerthesequestions.1.What’sthetopicofthetext?2.Whatthreeplantsarefeatured?Co-evolution.Theyucca,theTraveller’sPalm,andtheOphrysorchid.3.Whatdothephotosshowyou?4.Whatthreeanimalpollinatorsarefeatured?Yuccaflowers,aTraveller’sPalm,andanOphrysorchid.Theyuccamoth,theMadagascarblacklemur,acertainkindofwasp(themale,notthefemalewasp).FirstreadingNowreadthetextmorecarefullyandanswerthesequestions.1.Whycannootheranimalsbuttheyuccamothpollinatetheyucca?It’sonlytheyuccamothwhichistherightsizeandshapetopollinatetheyucca.2.CanyouguesswhytheTraveller’sPalmhasthatname?TheTraveller’sPalmhasthisnamebecausetravellersusedtodrinkitsnectarwhentheywerethirsty.3.Whatdoyouthink“sweettooth”means?Ifapersonorananimalhasa“sweettooth”,theylikesweetfoodverymuch.4.Whydothemalewaspstrytomatewiththeorchidflowers?Themalewaspstrytomatewiththeorchidflowersbecausetheylooklikeandsmelllikefemalewasps.5.Whydothefemalewaspsvisittheorchidflowers?Dotheyhavearoleinpollination?Thefemalewaspsvisittheorchidflowerstocollectthechemicalthatthemalewaspswereattractedtoearlier.Thefemalewaspsdonothavearoleinpollinationsincetheflowersaredyingwhentheyvisitthem.SecondreadingNowreadandthinkabouttheadvantagesanddisadvantagesoftherelationshipsbetweentheplantsandpollinationsdescribedinthetext.Checkyourunderstandingandcompletethetable.Plant/pollinatorAdvantagesDisadvantagesYuccaMothTheyuccaiscertaintobepollinated.Themoth’scaterpillarshaveacertainsupplyoffoodTheyaretotallydependentoneachotherforsurvival.Plant/pollinatorAdvantagesDisadvantagesTraveller’spalmLemurThepalm’sflowercanbeopenedbythelemur.Thelemurhasasourceoffood.Thereisadisadvantageforthepalmonlyiftherearenolemursorotheranimalspresentstrongenoughtoopentheflowers.Plant/pollinatorAdvantagesDisadvantagesOrchidWaspTheorchidiscertaintobepollinated.Theyaretotallydependentoneachotherforsurvival.Thefemalewaspscollectachemicalfromtheorchidneededtoattractthemalestothem.DiscussionDiscusswhatyouthinkwouldhappentotheanimalpollinatorsofeachoftheplantsdescribediftheseplantsdiedout.Suggestedanswers:Theyuccaandtheyuccamoth:Ifyuccaplantsdiedout,theYuccamothwouldalsodieoutasthecaterpillarsneedtheyuccaseedsforfood.IftheTraveller’spalmdiedout,theMadagascarblacklemurwouldnotdieoutasitcanfindothersourcesoffood.TheTraveller’spalmandtheMadagascarblacklemur:TheOphrysorchidandthewasp:IftheOphrysorchiddiedout,thewaspwouldalsodiedoutasthefemalewaspneedsthechemicalproducedbytheorchidtoattractthemalewasps.