首页
登录
职称英语
Mycorrhizal fungi infect more plants than do any other fungi and are neces
Mycorrhizal fungi infect more plants than do any other fungi and are neces
游客
2025-04-24
28
管理
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. Despite 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. [br] 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://tihaiku.com/zcyy/4051187.html
相关试题推荐
Mycorrhizalfungiinfectmoreplantsthandoanyotherfungiandareneces
Mycorrhizalfungiinfectmoreplantsthandoanyotherfungiandareneces
Evenplantscanrunafever,especiallywhentheyareunderattackbyinsect
Evenplantscanrunafever,especiallywhentheyareunderattackbyinsect
Evenplantscanrunafever,especiallywhentheyareunderattackbyinsect
Evenplantscanrunafever,especiallywhentheyareunderattackbyinsect
Evenplantscanrunafever,especiallywhentheyareunderattackbyinsect
Evenplantscanrunafever,especiallywhentheyareunderattackbyinsect
Evenplantscanrunafever,especiallywhentheyareunderattackbyinsect
Evenplantscanrunafever,especiallywhentheyareunderattackbyinsect
随机试题
Whichofthefollowingstatementsistrueaccordingtowhatyouhear?[br][ori
Weighingtoomuchcandamageone’shealth,andobesityisagrowingproblem
关于债券收益率,以下叙述正确的是()。A.不同种类发行人发行的债券之间收益率的
肝气犯胃型胃痛治宜A.柴胡疏肝散加减 B.清中汤加减 C.四君子汤
财政政策的“内在稳定器”作用可以通过政府税收的自动变化实现。当经济繁荣时,失业率
社会工作者介入司法过程自司法判决前的案件审理阶段就已经开始,其主要工作对象包括(
某单位年初无偿为甲村建设一个光伏发电站,每年发电2.5万千瓦时,每千瓦时收益为1
2021年3月12日,《中华人民共和国国民经济和社会发展第十四个五年规划和
对项目计算期相同而原始投资不同的两个互斥投资项目进行决策时,适宜单独采用的方法是
下列属于资金业务前台交易操作风险的有()。A.交易员未及时止损,未授权交易或超
最新回复
(
0
)