首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Mycorrhizal fungi infect more plants than do any other fungi and are necessary for many plants to thrive, but they have escaped
Mycorrhizal fungi infect more plants than do any other fungi and are necessary for many plants to thrive, but they have escaped
admin
2011-01-26
43
问题
Mycorrhizal fungi infect more plants than do any other fungi and are necessary for many plants to thrive, but they have escaped widespread investigation until recently for two reasons. First, the symbiotic association is so well-balanced that the roots of host plants show no damage even when densely infected. Second, the fungi cannot as yet be cultivated in the absence of a living root. De spite these difficulties, there has been important new work that suggests that this symbiotic association can be harnessed to achieve more economical use of costly super phosphate fertilizer and to permit better exploitation of cheaper, less soluble rock phosphate, Mycorrhizal benefits are not limited to improved phosphate uptake in host plants. In legumes, mycorrhzal inoculation has increased nitrogen fixation beyond levels achieved by adding phosphate fertilizer alone. Certain symbiotic associations also increase the host plant’ s resistance to harmful root fungi. Whether this resistance results from exclusion of harmful fungi through competition for sites, from metabolic change involving antibiotic production, or from increased vigor is undetermined.
Which of the following most accurately describes the passage?
选项
A、A description of a replicable experiment
B、A refutation of an earlier hypothesis
C、A summary report of new findings
D、A confirmation of earlier research
答案
C
解析
综观全文,以及文章开头提到的“but they have escaped widespread investigation until recently”可知这是对一个科学新发现的阐述。A项“对可重复实验的描述”,B项“对假设的批驳”,D项“对早期研究的确认”均不对。
转载请注明原文地址:https://kaotiyun.com/show/Y9BO777K
0
考博英语
相关试题推荐
Lookatthenotesbelow.Someinformationismissing.Youwillhearawomanphoningthroughanordertoheadoffice.
Lookatthenotesbelow.Someinformationismissing.Youwillhearawomanphoningthroughanordertoheadoffice.
Youwillhearaconversationthroughaphone.Foreachquestion(23-30),markoneletter(A,BorC)forthecorrectanswer.After
Youwillhearaconversationthroughaphone.Foreachquestion(23-30),markoneletter(A,BorC)forthecorrectanswer.After
Youwillhearaconversationthroughaphone.Foreachquestion(23-30),markoneletter(A,BorC)forthecorrectanswer.After
Youwillhearaconversationthroughaphone.Foreachquestion(23-30),markoneletter(A,BorC)forthecorrectanswer.After
Lookattheformbelow.Someinformationismissing.Youwillhearawomanbookingexhibitionspaceonthephone.Foreachquest
Youplantoattendaninternationaladvertisementexhibition,andyouwanttofindapromisingadvertisementagencytoberespon
●Lookattheorganizationplanbelow.Itshowsthedifferentdivisionsofamanufacturingcompany.●Forquestions6--10,Where
•Readthearticlebelowaboutworkingindifferentsizedcompanies.•Aresentences16-22ontheoppositepage’Right’or’Wrong’
随机试题
检疫人员进行生猪宰后检疫时,肉眼发现某屠宰猪肉膈肌中有针尖大小的白色小点。低倍镜检查见梭形包囊,囊内有卷曲的虫体。该虫体最可能是()
下列是软膏水溶性基质的是
《检测和校准实验室能力的通用要求》(ISO/IEC17025:2017)适用于所有从事实验室活动的组织,不论其人员数量多少。()
国家实施西部大开发战略的长远目标包括()。
某消防技术服务机构对某建筑设置防烟排烟系统安装质量进行了检查,下列结果中,符合现行国家标准《建筑防烟排烟系统技术标准》的有()。
租船合同中的条件条款是指对实现合同的商业目的有着密切关系的条款。()
装箱单是用以说明货物包装细节的清单,又称为()。
A是4阶实对称矩阵,A2+2A=0,r(A)=3,则A相似于().
試験に合格するには、がんばる________。
PeoplewhospendalotoftimesurfingtheInternetaremorelikelytoshowsignsofdepression,BritishscientistssaidonWedn
最新回复
(
0
)