优课网
首页
数学
语文
英语
化学
物理
政治
历史
生物
首页
> 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
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
题目简介
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
题目详情
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。
嫁接的步骤示意图
[ ]
A.形成层
B.木质部
C.韧皮部
D.切口
题型:单选题
难度:偏易
来源:专项题
答案
A
上一篇 :
欲使一株月季上开出几种颜色的
下一篇 :
人们常用扦插、嫁接等方法繁殖
搜索答案
更多内容推荐
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
Do you enjoy listening to records? I find records are often ______ or better than an actual performa
Scientists will have to come_______ new methods of increasing the world’s food supply.A.up forB.up w
On the wall hung an overcoat, _______color is blue.whose B. of which C. which D. its-高一英语
---Laura calls on her teacher pretty ____, doesn’t she? ---Yes. At least three times every week.A.fi
The local government has been accused of not responding _________ to the needs of the homeless in th
As is known to all language learners, the newly learnt words will soon be forgotten unless they are
返回顶部
题目简介
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
题目详情
嫁接的步骤示意图
B.木质部
C.韧皮部
D.切口
答案