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
2005-11-28
112
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 mot. 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, mycorrhizal 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.
The passage suggests which of the following about the increased resistance to harmful root fungi that some Plants infected with mycorrhizal fungi seem to exhibit?
选项
A、There are at least three hypotheses that might account for the increase.
B、The plants that show increased resistance also exhibit improved nitrogen fixation.
C、Such increases may be independent of mycorrhizal infection.
D、It is unlikely that a satisfactory explanation can be found to account for the increase.
答案
D
解析
综观全文,与菌根真菌共生的植物对其他有害真菌有抵抗作用,对其原因,文中提到三种意见,但究竟是哪一种目前还不能确定。因此D项为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/5QIO777K
0
考博英语
相关试题推荐
•Readthearticlebelowaboutfinancialrisks.•Choosethebestsentencetofilleachofthegaps,•Foreachgap8—12,markone
Lookatthestatementsbelowandthetextabouttheimportanceoflisteningtopeopleontheoppositepage.Whichsectionof
LookatthestatementsbelowandtheextractontheoppositepagefromareporttostaffbytheDavisGroup,ahumanresourcesc
Thecompanyismostworriedabouthow______.Whenputtingacallthrough,staffshouldalways______.
WhichhoteldoesGraham’scolleaguerecommend?Whichchartiscorrect?
Lookatthenotesbelow.Someinformationismissing.Youwillhearawomanphoningthroughanordertoheadoffice.
StudentslearningabouthowlifebeganonEarthmaybepresentedwiththeperplexingquestion,"Whichcamefirst,thechickenor
FlowersfortheDeadSinceflowerssymbolizenewlife,itmayseeminappropriatetohavethematfunerals.Yetpeopleinma
Ifhe(wastocome)herethisafternoon,I(shouldask)himtogototheparty(heldby)student(union).
STANZA:POEM
随机试题
输血前血型血清学检查不包括
对医德情感的正确理解是
A.暂时制动B.牙间结扎C.颌间结扎D.切开复位内固定术E.暂不处理,随访移位明显的骨折,不能手法复位的,需要
企业关联方利息支出税前扣除的陈述,正确的有()。
刘某,男,36岁,年幼时父母离异,现在跟父亲和姐姐一起生活,不再与母亲来往。刘某小学时特别调皮,经常惹事,父亲脾气暴躁,常对他拳脚相加。刘某与父亲的关系一直很紧张,和姐姐则比较亲近。1992年,刘某因犯罪被判无期徒刑、剥夺政治权利终身。服刑期间,刘某因表现
2000年9月,天泉市政府为周某办理了地处水湾村某地块的《集体土地建设用地使用证》(以下简称《土地使用证》),水湾村委会不服,向天泉市法院提起行政诉讼,要求撤销天泉市政府为周某所颁发的《土地使用证》。原告诉称,周某系城镇非农业户口。周某没有向水湾村提出宅基
下列有关中国古代天文知识的表述,正确的是()。
春节将至,甲学校决定为教职工分发福利,同乙贸易公司签订了购买500台热水器的合同。乙公司遂同丙运输公司签订了运输合同,由其将热水器运到甲学校。热水器运到后,乙公司进行了安装调试,认为合格后,甲学校付款完毕。可是春节过后,教师丁在洗澡的过程中,热水器发生了漏
农民问题是中国革命的基本问题,新民主主义革命实质上就是中国共产党领导下的农民革命,下列对此理解正确的是
McDonald’s,Greggs,KFCandSubwayaretodaynamedasthemostlitteredbrandsinEnglandasKeepBritainTidycalledonfast-fo
最新回复
(
0
)