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
"Salty" Rice Plant Boosts Harvests British scientists are breeding a new generation of rice plants that will be able to grow
"Salty" Rice Plant Boosts Harvests British scientists are breeding a new generation of rice plants that will be able to grow
admin
2015-07-17
77
问题
"Salty" Rice Plant Boosts Harvests
British scientists are breeding a new generation of rice plants that will be able to grow in soil containing salt water. Their work may enable abandoned farms to become productive once more.
Tim Flowers and Tony Yeo, from Sussex University’s School of Biological Sciences, have spent several years researching how crops, such as rice, could be made to grow in water that has become salty.
The pair have recendy begun a three-year programme, funded by the Biotechnology and Biological Sciences Research Council, to establish which genes enable some plants to survive salty conditions. The aim is to breed this capability into crops, starting with rice.
It is estimated that each year more than 10m hectares (公顷) of agricultural land are lost because salt gets into the soil and stunts (妨碍生长) plants. The problem is caused by several factors. In the tropics, mangroves (红树林) that create swamps (沼泽) and traditionally formed barriers to sea water have been cut down. In the Mediterranean, a series of droughts have caused the water table to drop, allowing sea water to seep (渗透) in. In Latin America, irrigation often causes problems when water is evaporated (蒸发) by the heat, leaving salt deposits behind.
Excess salt then enters the plants and prevents them functioning normally. Heavy concentrations of minerals in the plants stop them drawing up the water they need to survive.
To overcome these problems, Flowers and Yeo decided to breed rice plants that take in very litde salt and store what they do absorb in cells that do not affect the plants’ growth. They have started to breed these characteristics into a new rice crop, but it will take about eight harvests before the resulting seeds are ready to be considered for commercial use.
Once the characteristics for surviving salty soil are known, Flowers and Yeo will try to breed the appropriate genes into all manners of crops and plants. Land that has been abandoned to nature will then be able to bloom again, providing much needed food in the poorer countries of the world.
Which of the following is NOT mentioned as a cause of the problem discussed in the passage?
选项
A、Natural barriers to sea water have been destroyed.
B、The water table has gone down after droughts.
C、Sea level has been continuously rising.
D、Evaporation of water leaves salt behind.
答案
C
解析
引起盐分渗入土壤的3个原因都在第四段里谈到了:第一是阻挡海水的天然屏障红树林被砍伐(A);第二是在地中海地区严重的旱灾导致水平面下降,海水渗透(B);第三是在拉丁美洲,水分被高温蒸发后留下了盐分(D)。
转载请注明原文地址:https://kaotiyun.com/show/p6Gd777K
本试题收录于:
职称英语理工类A级题库职称英语分类
0
职称英语理工类A级
职称英语
相关试题推荐
TheWeddellsealofAntarcticacandivetoadepthofabout,1,600feetandremainsubmergedforaslongasanhourandtenminu
MobilePhoneandDiseasesAstudybyscientistsinFinlandhasfoundthatmobilephoneradiationcancausechangesinhuman
Modernnursingpracticesnotonlyhastentherecoveryofthesickbutalsopromotebetterhealththroughpreventivemedicine.
ChangesinMuseumsMuseumshavechanged.Theyarenolongerplacesthatone“should”visit,theyareplacestoenjoyandl
A.1959constitutionalamendmentB.southeastAsiaC.1960sD.rainyE.1991constitutionalamendmentF.1980sSingaporeisan
Singapore1.Singaporeisanindependentcity-stateinsoutheasternAsia,consistingofonemajorislandtheSingaporeIsland--an
Singapore1.Singaporeisanindependentcity-stateinsoutheasternAsia,consistingofonemajorislandtheSingaporeIsland--an
HoldthetorchsteadysoIcanseebetter.
ArcticMeltEarth’sNorthandSouthPolesarefamousforbeingcoldandicy.Lastyear,however,theamountoficeintheArctic
随机试题
会计制度设计
下列方法中,用于处理变价清算财产的有()
试述行政发展的基本特点。
观察者因看到榜样受到强化而如同自己也受到强化一样,这称为()
大剂量地塞米松抑制试验皮质醇抑制超过50%,可考虑为
男孩,左肘摔伤急诊就医,小夹板外固定后,前臂高度肿胀,手部青白发凉,麻木无力,经拍X线片,诊断为左肱骨髁上骨折,若不及时处理,其最可能的后果是
动力黏性系数μ的单位是Pa。s用M、T、L表示μ的量纲是()。
干粉灭火系统的干粉储存容器是用来储存干粉灭火剂的容器,一般为()。
资本是投资者为开展生产经营活动而投入的资金。会计上的资本指的是投资者投入的资本,包括债权人投入的资本。()
下列属于票据功能的有()。
最新回复
(
0
)