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草本植物报春花多数为二型花柱，少数为同型花柱．二型花柱的花中，花药的位置明显低于柱头的为长柱型花，柱头位置明显低于花药的为短柱型花．同型花柱的花中，花药与柱头高度相近．研究发现随着海拔高度增加，高山...
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高三下学期生物《》真题及答案
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草本植物报春花多数为二型花柱少数为同型花柱如图1所示．花药的位置明显低于柱头的为长柱型花柱头位置明
植物花的结构中具有生殖细胞的结构为①花柱②柱头③胚珠④花丝⑤花药
①⑤
②③
④⑤
③⑤
金缕梅科植物为本具毛单叶二生子房位花柱枚且果化
观赏植物藏报春是一种多年生草本植物两性花异花传粉在温度为20℃~25℃的条件下红色A.对白色a为显性
伞形科植物花的花柱基部具有①
唇形科与马鞭草科的区别是马鞭草科植物多为木本稀为草本花柱生子房不果为或而唇形科植物多为草本稀为木本花
一朵花的雌蕊是由下列哪几部分组成?
花药和花丝
花柱和子房
柱头、花柱和子房
花药和花柱
在植物传粉和受精过程中花粉萌发长出的花粉管依次经过的结构是
花丝、花柱、子房、胚珠
柱头 、花柱、子房、胚珠
花柱、花丝、花药、胚珠
柱头、花柱、 胚珠、子房
多数植物花的花柱为所充塞有的植物的花柱中央是空心的管道称
草本植物报春花多数为二型花柱少数为同型花柱如图1所示．花药的位置明显低于柱头的为长柱型花柱头位置明
草本植物报春花多数为二型花柱少数为同型花柱如图1所示．花药的位置明显低于柱头的为长柱型花柱头位置明
观赏植物藏报春是一种多年生草本植物两性花异花传粉在温度为20℃～25℃的条件下红色A.对白色a为显性
无花果属植物的隐头花序中能结实
短花柱花
长花柱花
两性花
单性花
无被花
雌花
观赏植物藏报春是一种多年生草本植物两性花异花传粉在温度为20～25℃的条件下红色A.对白色a为显性基
唇形科的主要特征草本常含而具香气茎形叶花序为花两性对称花冠形雄蕊4枚为雌蕊心皮合生子房上位子房常花柱
绿色开花植物的雌蕊是由构成的
花药和花丝
柱头、花柱和子房
花柱和子房
花药和花柱
金钱草为
木犀科植物过赂黄的全草
唇形科活血丹的全草
报春花科过路黄的全草
报春花科聚花过路黄的全草
伞形科破铜钱的全草
被子植物的雌蕊是由构成的.
花药和花丝
花药和花柱
柱头、花柱和子房
花柱和子房
观赏植物藏报春是一种多年生草本植物两性花异花传粉在温度为20℃～25℃的条件下红色A.对白色a为显性
大麻科原置于桑科中后因其等特征而另立一科
花单性异株
花单被
草本，无乳汁
花柱2裂
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如图所示的电路中小灯泡上标有“6V3.6W”字样滑动变阻器R1的最大电阻为40Ω当只闭合SS2滑动变阻器的滑片P在中点时小灯泡正常发光当所有开关都闭合滑片滑到A端时A1A2的示数之比是31灯的电阻保持不变．求 1小灯泡正常发光时的电流 2电源电压 3当只闭合SS2滑动变阻器的滑片P在A端时小灯泡两端的实际电压． 4小灯泡消耗的最小电功率不能为0．
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“瓦特”是下列哪个物理量的单位
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电动汽车越来越多地进入普通家庭电动汽车的核心部件是电动机下面图中能正确反映电动机工作原理的是
如图所示电路电源电压不变小灯泡标有“6V3W“字样闭合开关后当滑片P移至某一位置时小灯泡恰好正常发光此时滑动变阻器消耗的功率为P1当滑片P移至某一端点时电流表示数为0.3A电压表示数变化了3V此时滑动变阻器消耗的功率为P2且P1P2＝56．下列判断正确的是
1分﹣Hurryup! ﹣Onemoment.Imye﹣mailsandthenI'mreadytogo. A.read B.amreading C.wasreading D.haveread
10分Expertsinnutrition营养suggestthatweshouldeatatleastfivedifferentkindsofvegetablesandfruitaday.Theyareverynecessaryforourhealthandhelpourbodiesworkwell.Theycanhelpreduce减少theriskofgettingill.Therearealotofvegetablesandfruittochoosefromandtheytastedelicious.1 It'seasytobuyourfoodfromthelocalsupermarketsowhydowegotothetroubleofgrowingourown?Hereareseveralgoodreasons 2Youcanpickandeatitatonce.Whenyouhavetriedityouwillagreethatvegetablesandfruitthatareeatenstraightfromthegardentastebetterthananythingyoucanbuyinasupermarket. Youmaywanttocutdownonyourfoodmiles﹣thedistancethataproducthastravelledbeforeitreachesyourkitchen.Manyfoodpackagesareflownhalfwayacrosstheearth.3 Homegrownfoodislikelytobehealthier.Foodproducersoftenusefertilizers化肥andpesticides农药whichcanendupinyourfood.Ifyougrowyourownthingsaredifferent.4Youmightalsochoosetogrowsometraditionalvegetablesandfruit.Theseoftenhavemoreofthevitaminsminerals矿物质andprotein蛋白质thatkeepyouhealthy. 5Andyoucangrowyourownevenifyouonlyhaveasmallbackyardorabalcony阳台.Somefoodcangrowwellinpotsincludinglettucetomatoespotatoesandcarrots.Youcanrecycleplasticbottlesandcupstogrowsomething.Justmakesurethereareholesfordrainage排水andasmallplateunderthemtocatchdropsofwater. Happygardening!
“东方红3”科学考察船图1于2018年顺利下水标志着我国自主创新研发的科学考察船挺进世界一流船型行列．该船长103米船宽18米排水量5800吨续航力1500海里．在一次航行中从某一时刻开始科考船受到水平方向的牵引力F随时间t的变化关系如图1﹣25甲所示船的运动速度v随时间t的变化关系如图2乙所示．海水的密度为1.02×103kg/m3g取10N/kg．求 1满载时科学考察船受到的浮力 2科学考察船吃水深度为5.5m时船底受到的海水压强 3从第50s到100s内牵引力所做的功．
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