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ID:35505426
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页数:3页
时间:2019-03-25
《青少新概念2aunit5补充阅读材料ants》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、INTERESTINGFACTSABOUTANTSLikeallinsects,antshavesixlegs・Eachleghasthreejoints.Thelegsoftheantareverystrongsotheycanrunveryquickly.Ifamancouldrunasfastforhissizeasanantcan,hecouldrunasfastasaracehorse・Antscanlift20timestheirownbodyweight.Anantbrainhasabout250000braincells・Ahumanbrainhas1
2、0,000millionsoacolonyof40,000antshascollectivelythesamesizebrainasahuman.Theaveragelifeexpectancyofanantis45-60days・Antsusetheirantenaenotonlyfortouch,butalsofortheirsenseofsmell.Theheadoftheanthasapairoflarge,strongjaws.Thejawsopenandshutsidewayslikeapairofscissors・Adultantscannotchewa
3、ndswallowsolidfood.Insteadtheyswallowthejuicewhichtheysqueezefrompiecesoffood・Theythrowawaythedrypartthatisleftover.Theanthastwoeyes,eacheyeismadeofmanysmallereyes・Theyarecalledcompoundeyes・Theabdomenoftheantcontainstwostomachs.Onestomachholdsthefoodforitselfandsecondstomachisforfoodtob
4、esharedwithotherants.Likeallinsects,theoutsideoftheirbodyiscoveredwithahardarmourthisiscalledtheexoskeleton.Antshavefourdistinctgrowingstages,theegg,larva,pupaandtheadult.Biologistsclassifyantsasaspecialgroupofwasps.(HymenopteraFormicidae)Thereareover10000knownspeciesofants.Eachantcolon
5、yhasatleastoneormorequeens.Thejobofthequeenistolayeggswhichtheworkerantslookafter.Workerantsaresterile,theylookforfood,lookaftertheyoung,anddefendthenestfromunwantedvisitors.Antsarecleanandtidyinsects・Someworkerantsaregiventhejoboftakingtherubbishfromthenestandputtingitoutsideinaspecial
6、rubbishdump!Eachcolonyofantshasitsownsmell.Inthisway,intruderscanberecognizedimmediately・ManyantssuchasthecommonRedspecieshaveastingwhichtheyusetodefendtheirnest.ThecommonBlackAntsandWoodAntshavenosting,buttheycansquirtasprayofformicacid・Somebirdsputantsintheirfeathersbecausetheantssqui
7、rtformicacidwhichgetsridoftheparasites.TheSlave-MakerAnt(PolyergusRufescens)raidsthenestsofotherantsandstealstheirpupae・Whenthesenewantshatch,theyworkasslaveswithinthecolony.Theworkerantskeeptheeggsandlarvaeindifferentgroupsaccordingtoages・Atnighttheworkerantsmovetheeggsandlarv
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