问题 实验题

(10分,每空2分)(1)某课外活动小组学习生物学的兴趣非常高,他们经常做一些探究实验来提高自己的创新能力,丰富知识。下面是这个活动小组对几种不同植物的种子(各200粒)在不同光照条件下进行萌发实验后的统计结果。

     植物种类

培养条件

小麦烟草菟丝子
光照91920
黑暗93090
   根据表中的统计数据,请你分析并得出结论,然后和其它同学交流。

结论:                                                       

(2)将4等份豌豆种子分别放在纱布上,置于培养皿中,给予不同的条件,数天后记录发芽情形如下表:

    内容

项目

场所温度纱布状态发芽情况
日光下23ºC潮湿全发芽
乙.日光下23ºC干燥没发芽
黑暗下23ºC潮湿全发芽
黑暗下23ºC干燥没发芽
①由上表可知种子发芽时需要         

②要证明黑暗对发芽的影响,则实验设计中照光的各组为     组。

③本实验结果证明,豌豆种子萌发与      有关,与      无关。

答案

(10分)(1) 小麦萌发跟光照无光;烟草萌发需要光照;菟丝子萌发不需要光照     

(2)① 水     ②  甲和乙    ③   水        光照         

(你自己做下哈)

本题考查的是探究种子萌发的条件。般情况下,我们认为在对照实验中呈现为自然状态(即未加处理)的一组为对照组,而进行了实验处理(或者说人工处理)的为实验组。

(1)本实验探究了光照是否是种子萌发所需要的环境条件,结合表格分析可知该实验的变量为光照,从数据的统计看:小麦萌发跟光照无关,烟草萌发需要光照,菟丝子萌发不需要光照。

(2)①实验甲和乙为对照组,变量为水分,从数据的统计看,可以得出的结论是种子萌发需要一定量的水分。

②从表格可直接看出,实验设计中照光的各组为甲和乙组。

③实验甲和丙对照,变量为光照,可以得出的结论光照不是种子萌发的环境条件,因为在潮湿和23℃下,有光无光种子都能萌发。故本实验结果证明,豌豆种子萌发与水分有关,与光照无关。

完形填空
Years ago,there was a very wealthy man who,with his devoted young son,shared a passion for art collecting .Together,they traveled around the world,adding only        art treasures to their collection.
One year,as winter approached,    engulfed(吞没) the nation,and the young man left to      in the army.After only a few short weeks,his father received a telegram.His beloved son was      in action.The art collector     awaited more news,     he would never see his son again.Within days,his fears were      .The young man had died while rushing a fellow soldier to a doctor.
Upset and        ,the old man faced the coming Christmas holidays with sadness.On Christmas morning,a knock on the door awakened the        old man.As he opened the door,he was greeted by a        with a large package in his hands.
He introduced himself to the old man by saying,“I was a      of your son .I was the one he was      when he died.May I come in for a few moments? I have something to show you.”
As the two began to     ,the soldier told of how the man’s son had told everyone of his,not to mention his father’s,      of fine art.“I am no     ,”said the soldier,“but I want to give you this.”
As the old man unwrapped the package ,he saw a portrait (画像)of his son.Though the world would        consider it the work of a genius,the painting featured the young man’s face        detail.
Overcome with emotion,the man      the soldier.After the soldier had left,the old man put the painting above the fireplace,pushing       thousands of dollars worth of art.His task completed,the old man sat in his chair and spent Christmas gazing at the        he had been given.
小题1:
A.poorestB.richestC.finestD.cheapest
小题2:
A.floodB.fireC.stormD.war
小题3:
A.saveB.protectC.serveD.build
小题4:
A.missingB.actingC.fightingD.dying
小题5:
A.calmlyB.anxiouslyC.quietlyD.secretly
小题6:
A.fearingB.doubtingC.wonderingD.expecting
小题7:
A.completedB.doubledC.removedD.confirmed
小题8:
A.nervousB.tiredC.lonelyD.frightened
小题9:
A.sadB.puzzledC.angryD.worried
小题10:
A.farmerB.soldierC.painterD.seller
小题11:
A.guardB.photographerC.partnerD.friend
小题12:
A.rescuingB.commandingC.guardingD.hiding
小题13:
A.argueB.moveC.talkD.eat
小题14:
A.descriptionB.loveC.senseD.understanding
小题15:
A.artistB.businessmanC.heroD.reporter
小题16:
A.sometimesB.neverC.oftenD.still
小题17:
A.forB.ofC.inD.on
小题18:
A.thankedB.questionedC.welcomedD.treated
小题19:
A.downB.upC.asideD.off
小题20:
A.treasureB.giftC.souvenirD.package
问答题 简答题