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
What is the focus of the passage?
What is the focus of the passage?
admin
2013-05-11
25
问题
What is the focus of the passage?
Scientists have discovered more details about how plants use water. Their findings could help to engineer plants that grow better and more effectively in conditions with higher levels of carbon dioxide. Plants naturally take in carbon dioxide they need for photosynthesis, the process of changing light energy to chemical energy. The carbon dioxide enters the plants through tiny holes or pores on the surface of leaves. However, each time a plant takes in one molecule of carbon dioxide gas, it loses hundreds of water molecules. Scientists say plants lose ninety-five percent of the water they take in through these pores. Some plants’ pores can tighten to save water during conditions of high carbon dioxide. Other plants are not able to do this as well. Now, scientists know how these tiny pores tighten in plants. They identify proteins that control the tightening of a plant’s pores. The proteins are enzymes called carbonic anhydrates. They believe the enzymes could be changed in some plants to increase their ability to store water. Changing plants to save more water will not affect plant growth. This method might be used to help engineer food crops that are resistant to extremely dry conditions. It could help farmers meet a growing demand for food as water supplies decrease.
选项
A、Carbon dioxide.
B、Chemical energy.
C、Molecule.
D、Proteins.
答案
D
解析
细节题。植物利用水的关键是一种蛋白质。
转载请注明原文地址:https://kaotiyun.com/show/YFQK777K
0
专业英语四级
相关试题推荐
Whichofthefollowingisacompound-complexsentence?
Amarketiscommonlythoughtofasaplacewherecommoditiesareboughtandsold.Thusfruitandvegetablesaresoldwholesalea
Amarketiscommonlythoughtofasaplacewherecommoditiesareboughtandsold.Thusfruitandvegetablesaresoldwholesalea
Ingeneral,theamountthatastudentspendsforhousingshouldbeheldtoone-fifththetotal______forlivingexpenses.
Whichjobwillinvolvesupervisingworkersusingdangerousequipment?
Accordingtothepassage,theaverageageofthefleetofDelta/Northwestis______.
Easternmedicinesarebecomingmorepopularinthewest,butfewpeoplerealizehowlongthetwocultureshaveexchangedideas.
HewasthesilentofthestormthateruptedaftertheviolentdeathofDiana,PrincessofWales.Theonlysurvivorofthehorrif
Oneofthemostcriticalproblems【C1】_____blackandotherminorityAmericanstodayisthedifficultyofentering【C2】_____socie
Shehasaterriblyhottemper,but______sheisreallykindtoherstudents.
随机试题
社会主义法治的核心是()
牙齿釉质表面呈淡黄色的原因是
现代医学模式是指
某国家重点扶持的高新技术企业,2008年经税务机关核定的亏损额为30万元,2009年度取得生产经营收入600万元,业务招待费实际发生4万元,销售合同违约金5万元。其他税前准予扣除的成本、费用、税金等合计300万元。下列说法正确的是()。
下列指标中,属于反映房地产市场运行状况的中观经济资源评估指标的是()。
林则徐主持编译的《四洲志》,介绍了世界各国的史地。鸦片战争后,主要以《四洲志》为基础成书的重要著作是()
在教学方法改革过程中,布鲁姆提出了()
我国经济体制的改革首先在农村取得突破性进展。党的十一届三中全会曾指出:“我国农业近二十年来的发展速度不快,它同人民的需要和四个现代化的需要之间存在着极其尖锐的矛盾。”当时我国农业和农村经济发展面临的主要问题有()
Therehasarisenduringthistwentiethcentury(asitarosebefore,inageswhichweliketocalldark)apronouncedantiintell
下列关于蓝牙技术的描述中,错误的是()。
最新回复
(
0
)