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
考研
Perhaps the most familiar plant movement belongs to one species of mimosa called the sensitive plant. Within seconds, it can low
Perhaps the most familiar plant movement belongs to one species of mimosa called the sensitive plant. Within seconds, it can low
admin
2011-01-17
48
问题
Perhaps the most familiar plant movement belongs to one species of mimosa called the sensitive plant. Within seconds, it can lower its leaves and make its tiny leaflets close up like folding chairs. This movement is thought to be initiated by electrical impulses remarkably similar to nerve signals in animals. But without the animals’ sophisticated motion machinery, the mimosa has had to be creative in devising a way to move.
For motion, the plant depends on tiny, bulb-shaped organs located at the base of each leaf stalk and leaflet. Called pulvini, these organs hold the plant parts in place. When the mimosa is stimulated—say, by a crawling insect or a sudden change in temperature—an electrical impulse sweeps through the plant. This causes potassium and then water to be shifted from certain cells in the pulvini to others, quickly turning one side of the organs flaccid. Because the pulvini can no longer support the leaves and leaflets, this shift results in a corresponding change in their position.
The author mentions folding chairs in the first paragraph in order to ______.
选项
A、settle a dispute
B、evaluate a claim
C、provide an illustration
D、point out a difference
答案
C
解析
作者的目的是为了给予形象地说明。
转载请注明原文地址:https://kaotiyun.com/show/v0Yi777K
本试题收录于:
GCT工程硕士(英语)题库专业硕士分类
0
GCT工程硕士(英语)
专业硕士
相关试题推荐
下列有关清朝法律制度的表述,正确的有()。
Whatmadeanimpressionontheauthor?Mostofthethingsinthestorewindowwere______.
Whatkindofpersonneedsthisservice?Howmuchwillitcostyouifyouwantfiveregularpapersandtwographstobetyped?
Somepsychologistsmaintainthatthinkingis______.Accordingtotheselection,muscleparticipationintheprocessofthinkin
Therealestatecorporationislookingfor______.Whichofthefollowingdotheynotprefer?
Theinformationintheformmaycomefrom______.ThesingleroomofferedinsectionAwouldbesuitableforastudent______.
Thereweremanypeoplepresentandheappearedonlyforafewseconds,soIonlycaughta______ofhim.
Whenweconductforeigntrade,theimportanceofunderstandingthelanguageofacountrycannotbeunderestimated.Thesuccessfu
Charles:Whattimeareyouleaving?Brown:I’mgoingtotrytoleaveby10:00.Charles:Takecareand______.Brown:Goodbye.Hop
*Employeeswithintheorganizationhaveopportunitiesforadditionalsalaryadvancement.Thetechnologyconsultantwill______.
随机试题
简述简单蒸气压缩制冷循环的基本构成。
___________是建立组织机构的首要环节或基本途径。
现代政党
简述计算机的组成部件。
镇静催眠药按化学结构可分为
下列因素中,影响企业生产能力的有()。
下列被誉为“国酒”“外交酒”的是()。
国共两党与各革命阶级第一次合作的政治基础是________。
第二代计算机所使用的主要逻辑器件为()。
•Readthearticlebelowaboutproblemsindoinginternationaltrade.•Foreachquestion23-28ontheoppositepage,choosethec
最新回复
(
0
)