植物的组织培养是利用____________的原理，使植物组织在人工控制的条件下，通过细胞的___________和__________，快速发育成新植株的高新技术手段。-八年级生物

更多内容推荐

• 青岛市十梅庵风景区内梅花品种众多、色彩艳丽，其中一种由技术人员培育的三角梅能开出红、白、紫等各种颜色的花朵。他们采用的方法应该是[]A．种子繁殖B．植物组织培养C．扦插D-八年级生物
• 一同学想在家里植栽菊花，为了保持菊花的优良品种，他应取的器官是[]A．一段枝条B．一粒种子C．一个果实D．一片叶子-八年级生物
• 晓莉同学将一株单色的野菊花，培育成具有多种颜色、多个花朵的“塔菊”，她采用了下列哪项技术[]A．种子繁殖B．扦插C．嫁接D．压条-八年级生物
• 欲使一株月季上开出几种颜色的花，应采用[]A．嫁接B．压条C．扦插D．播种-八年级生物
• 嫁接就是把一个植物体的芽或枝，接在另一个植物体上，使结合在一起的两部分长成一个完整的植物体。嫁接时应当使接穗与砧木的______紧密结合，以确保接穗成活。嫁接的步骤示意-八年级生物
• 人们常用扦插、嫁接等方法繁殖果树，同有性生殖相比，其主要优点是[]A．后代具有更强的生活力B．每代每年可提前结果C．增加后代变异性D．后代保持亲本性状-八年级生物
• 一棵苹果树上能结出“国光”、“红富士”等不同品种的苹果，采用的处理技术是[]A．扦插B．嫁接C．压条D．播种-八年级生物
• 利用兰花的一段茎尖，能在一年内生产出上百万株兰花幼苗的方法是[]A．植物组织培养B．嫁接C．出芽生殖D．分裂生殖-八年级生物
• 下图是组织培养流程图，据图回答：(1)假设A瓶内是某木本植物的一段茎尖，经过组织培养，长成了一株植物，这段茎尖可称为_________，进行组织培养的理论依据是____。(2)培养时-八年级生物
• 人工培养基中含有植物生长发育需要的各种_________、____以及一定种类和浓度的植物生长____。-八年级生物
• 关于组织培养的优点叙述不正确的是[]A．培育植物新品种B．防止植物病毒的危害C．创造新物种D．短时间内大量繁殖植物-八年级生物
• 嫁接后的植物一般保持哪种植物的优良性状[]A．接穗B．砧木C．二者的综合性状D．与二者性状无关-八年级生物
• 请结合农业生产实际，解答下列问题：（1）菊花既能进行无性生殖，又能进行有性生殖，如果要保持菊花的优良特性，易用______来繁殖；如果想培育新品种的菊花，多采用_______生殖-八年级生物
• 现有甲、乙、丙三个品种的苹果，将甲（接穗）嫁接到乙（砧木）上，接穗成活后，再用丙对其授粉，得到的苹果可食部分的性状相似于[]A．甲B．乙C．丙D．甲和丙-八年级生物
• 下图是对苹果树操作步骤示意图，分析回答（1）图中操作步骤是在生产实践中常见的营养繁殖方式，称作_______。（2）①②分别称为___________________。①与②结合时应当使①与②的___
• The repair work may take us a long time，but it’s worth trying.A．besidesB．otherwiseC．anyhow D．except
• (2014·乌鲁木齐高三年级第二次诊断性测验)I might fail，but________I insist on doing it.I never lose heart.A．somewayB．an
• This is only a solution that can be adopted to solve the problem , so you have to find a better way.
• Drunk driving used to occur ________ in our city，but now such cases are rare.A．practicallyB．generall
• We used to see each other ________，but I haven't heard from him since last year.(2012·辽宁)A．esp
• (2013·高考辽宁卷)Everything seemed to be going ________for the first two days after I moved to New York.A
• Simon has lived in Spain for more than 10 years, but _______ enough, he can’t speak a word of Spani
• Nelson Mandela, former president of South Africa, devoted himself to making the black and white equa
• What a terrible experience ! ________, you’re safe now —— that’s the main thing.A．Anyway B．BesidesC．
• We could hardly believe what she says because she is____ ____changing her mind.A．regularlyB．steadily
• Everything seems to be going______for the first two weeks after I moved to London.A．smoothlyB．vividl
• Since Tom ___downloaded a virus into his computer, he can not open the file now．A．readilyB．horriblyC
• She seems_happy in her new job since there is nothing troublesome to bother her. A．generallyB．flexib
• A football suddenly flew over our head and it ______ missed hitting a child playing nearby.A．narrowl
• ____, I got better and returned to work.A．Accidently B．NormallyC．EventuallyD．Particularly-高二英语
• A new study of HIV-infected people in Haiti indicates that starｔing treatment early could save many
• A car accident happened on the highway because of the heavy fog, but no one got seriously injured.
• Young people spend most of their time _________, for they don’t want to stay at home all day.A．outdo
• Because he works far away from his parents, he visits them only_____.A．independentlyB．commonlyC．occa
• ---- I was riding along the street and all of a sudden, a car cut in and knocked me down. ---- You c
• The final score of the basketball match was 93-94. We were only _____ beaten.A．nearlyB．narrowlyC．sli
• I’d like to start my own business next year – that’s _________ I will face my big challenge in life
• He was the last man I wanted to meet, but I managed to smile at him.A．therefore B．howeverC．besides
• As technology continues to advance，we must learn and adaptor we'll risk becoming a dinosaur.A．i
• New digital mobile phones definitely produce less radiation, but that doesn’t ______ mean that they
• I ran across a car crash in Hong Kong, and ________, both sides just politely exchanged the telephon
• He has made progress that we all praise him．A．so a greatB．such a greatC．so greatD．such great-高一英语
• _______, he doesn’t study well.A．As he is cleverB．He is as cleverC．Clever as he isD．As clever he is-
• , I got better and returned to work.A．AccidentlyB．NormallyC．EventuallyD．Particularly-高二英语
• You can’t be too careful to drive your car in the city now. Your car ________ missed a cyclist a mo
• _____ the woman entered the office, Tom’s eyes lit up.A．ImmediatelyB．BeforeC．ForD．With-高二英语
• It’s impossible for ____ few people to finish ____ a lot of work in only two days. A．such; suchB．so;
• It was_______ that they went for a drive in the countryside.A．such a fine weatherB．so fine a weather
• Please admire the ___decorated rooms where King HenryⅤⅢ met kings from other countries.A．beautifully
• She doesn’t speak her friend, but her written work is excellent.A．as well asB．as often asC．as much a