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1、6.Thebasicpartsofaplantaretherootsystem,whichisbelowtheground,andtheshootsystemabove.植株最基本组成部分是地下根系统和地上茎系统.8.Ittakesin,orabsorbs,waterandmineralsfromthesoilthroughtheroothairs,whicharesinglecellsnearthetipofeachroot.根毛是靠近根顶端的单细胞,它可以从土壤中吸收水分和矿物质.12.Inaddit
2、ion,plantssuchascloverandLucerne,knownas‘legumes’,havespecialbacteriawhichliveontheroots.另外,一些豆科作物,如三叶草和苜蓿,有特殊的细菌寄生在根部.18.Anotherimportantfunctionistoenablewaterandmineralstopassupfromtherootstotheleavesandflowers.另一种重要的功能是使水和矿物质从根运输到叶片和花上.21.Theirmainjob
3、istomakefoodfortheplantbytheprocessknownasphotosynthesis.它们的主要任务是通过光合作用为作物提供营养.23.Waterfromthesoilandcarbondioxidefromtheairareconvertedintosugarsandothercarbohydrates.来自土壤中的水和来自大气中的二氧化碳被转变成糖和碳水化合物.26.Thestamensproducethemalesexcells,orspermatic,whicharcc
4、arriedinthepollengrains.雄蕊产生雄性细胞或是性孢子,它们携带在花粉粒上.28.Thefruit,theripenedovaryoftheflower,enclosestheseedsandprotectsthemwhiletheyaredeveloping.果实,花中成熟的子房,包围着种子,并在它们发育时候保护它们.29.Theseeditselfconsistsofanembryoandfoodstore.种子是由胚和胚乳构成的.30.Theembryoisthepartwhic
5、hwilldevelopintoantherplantandthefoodstoreisnecessarytoprovidenourishmentfortheyoungplantwhileitisgrowing.胚是能发育成新的植株的器官,胚乳为发育中的幼体提供必要的营养.Unit23.Seedsremaindormant,orinarestingstate,iftheyarekeptcoolanddry.种子在低温和干燥条件下,处于休眠状态.4.Whentheamountofmoistureandthe
6、temperaturelevelareright,theseedsgerminateandstartgrowing.当温度和湿度适宜时,种子发芽并开始生长.13.Thisisbecausewetsoilsremaincoldforalongerperiodoftimethandrier,well-drainedsoils.这是因为湿的土壤比干燥的排水好的土壤能维持更长时间的低温.16.Dormantseedsrequireverylittleoxygeninordertostayalive,butwhen
7、theystarttogerminatetheyrequiremore.种子在休眠状态时为保持活力需要较少02,但当它们发芽时需要较多的02.20.Intheearlystagesofdevelopmenttheseedlingdependsentirelyonthefoodstoreintheseedbutassoonasthefirstleavesarcproduced,itisabletomanufacturefoodforitself.发育早期,幼苗完全依靠种子中的胚乳,但是一旦第一片子叶产生,它
8、就能为自己生产食物.25.Intheprocessofpollinationthepolleniscarriedbywindorinsectsfromthestamenstothestigmaofthecarpel.传播花粉的过程中,花粉被风或昆虫从雄蕊带到雌蕊柱头上.26.Itgerminatesonthestigmaandgrowsdownthestyleintotheovary,wherefertilizationtak