人教版选修九课件Unit 4 Exploring Reading task

ReadingonP78 Co–Evolutionyucca丝兰 yuccamoth TheTraveller’sPalm棕榈树 TheMadagascarblacklemur TheOphrysOrchid兰花 wasp WarmingupDiscussthequestion:What’stherelationshipbetweenplantsandanimals? Pre-readingBeforeyoureadthetext,glancequicklythroughitandanswerthesequestions.1.What’sthetopicofthetext?2.Whatthreeplantsarefeatured?3.Whatdothephotosshowyou?4.Whatthreeanimalpollinatorsarefeatured? What’sthetopicofthetext?2.Whatthreeplantsarefeatured?Co-evolution.Theyucca,theTraveller’sPalm,andtheOphrysorchid. 3.Whatdothephotosshowyou?4.Whatthreeanimalpollinatorsarefeatured?Yuccaflowers,aTraveller’sPalm,andanOphrysorchid.Theyuccamoth,theMadagascarblacklemur,acertainkindofwasp(themale,notthefemalewasp). FirstreadingNowreadthetextmorecarefullyandanswerthesequestions.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. TheTraveller’spalmandtheMadagascarblacklemur:IftheTraveller’spalmdiedout,theMadagascarblacklemurwouldnotdieoutasitcanfindothersourcesoffood. TheOphrysorchidandthewasp:IftheOphrysorchiddiedout,thewaspwouldalsodiedoutasthefemalewaspneedsthechemicalproducedbytheorchidtoattractthemalewasps.