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
2015-02-17
29
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 recently 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 little 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/ClUd777K
本试题收录于:
职称英语综合类A级题库职称英语分类
0
职称英语综合类A级
职称英语
相关试题推荐
BlackHolesTriggerStarstoSelf-DestructScientistshavelongunderstoodthatsupermassive(超大质量的)blackholesweighingmill
Traditionalworkersshowednointerestinmanagement.Theworkers’participationinmanagementmightsaveaplantfromclosing
Accordingtothepassage,whatdothepassengersusuallyseewhentheyareonalongbustrip?Thewriterofthispassagewould
Theleadingastronomersofthesixteenthandseventeenthcenturieswerefascinatedbycomets.
GunRightsintheUSImmediatelyaftertheshootingatVirginiaTechUniversity,Americansgatheredtomournthedead.Thepresi
HumanandCultureHumanbeingsareanimals.Webreathe,eatanddigest,andreproducethesamelifeprocessescommontoal
Forfinancialreasons,scientistsareoftencompelledtoforsaketheirresearch.
ShowLovebyKnittingMymotherknewhowtoknit,butshenevertaughtme.Sheassumed,asdidmanywomenofhergeneration,
Themoonwasobscuredbythickclouds.
Travellingcompanionsareadisadvantage,accordingtothewriter,becausethey______.IthasbeenassumedbyJapanesethathe
随机试题
瓣简述领导者树立改革创新观念的必要性。
骨折线从梨状孔下方,牙槽突上方两侧水平方向延伸至上颌翼突缝自鼻额缝向两侧横过鼻梁、眶内壁、眶底颧上颌缝沿上颌骨侧壁达翼突
脓性指头炎处理不及时易引起
对层流净化特点的错误表述是
当企业面临激烈的市场竞争时,被迫的物流服务和物流成本策略常常是()。
大数定理是指在随机试验中,每次出现的结果不同,但是大量重复试验出现的结果的平均值却几乎总是接近于某个确定的值,即该事件发生的概率。根据上述定义,下列事件能够用大数定理解释的是()。
2014年1月份,烟酒及用品价格同比下降0.7%。其中,酒类价格下降2.0%,炯草价格上涨0.2%。衣着价格同比上涨1.9%。其中,衣着加工服务费价格上涨5.3%,服装价格上涨2.0%,鞋类价格上涨1.5%。家庭设备用品及维修服务价格同比上涨1.5%。其中
张:公司若能使雇员照顾好孩子,公司将有利可图,因为这些孩子将会成为公司未来的顾客、雇员甚至经理。因此,公司应当采取诸如发放白天托儿津贴之类的措施来方便父母亲们。李:但是,没有任何一个公司将会仅被他自己成员的孩子所惠顾,仅雇用自己雇员的孩子,仅被自己雇员的孩
(2014年真题)甲路过某饭馆时见万某酩酊大醉,便冒充万某的朋友上前将其扶走,到一偏僻的地方后,将万某随身携带的价值5000元的财物全部取走。甲的行为构成()。
TheMissAmericacelebration【C1】______asabeautycontestin1921,butnowpreferstoavoidsuch【C2】______sincebeautyisnolon
最新回复
(
0
)