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
38
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.
It can be inferred from the passage that the mimosa is called the sensitive plant because it ______.
选项
A、reacts to outside stimulation
B、has smaller leaves than most other plants
C、depends on organs called pulvini
D、contains potassium and water
答案
A
解析
根据第2段第3句话“含羞草受到外部的刺激后会在数秒内垂下叶子”。
转载请注明原文地址:https://kaotiyun.com/show/S0Yi777K
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
能够影响法的遵守主体遵守法律的因素有()。
Tom:Youareplayingguitarwell.Canyoureadmusic?Charles:No,Idon’t.Ijustlistentosongsontheradioandthenplayth
Whatmadeanimpressionontheauthor?Mostofthethingsinthestorewindowwere______.
Whichofthefollowingisthemainpurposeofthisannouncement?Accordingtotheannouncementwhichofthefollowingistrueo
Somepsychologistsmaintainthatthinkingis______.Accordingtotheselection,muscleparticipationintheprocessofthinkin
Michael:Hi,mom.I’dlikeyoutomeetmygirlfriend,SusanLee.Susan,thisismymother.Susan:Howdoyoudo,Mrs.Miller.Mo
Rebecca:______Dora:Really?Well,personally,Ithinkhewearsthewrongcolors.Actuallylightcolorsdon’treallysuithim.
A:DoctorSmithisengagedonWednesday.WouldyouliketocomeonThursday?B:______.
Americanseat______astheyactuallyneedeveryday.
Thesalaryrangeindicatesthat______.
随机试题
短棒菌苗主要激活:
具有降血压作用的药物有
湿热灭菌法中F0的要求为
形成慢性脓胸的原因有( )。
含麝香酮的动物有
项目融资重点解决的是( )。
证券投资顾问业务档案的保存期限自协议终止之日起不得少于()年。
甲公司2017年12月25日支付价款4080万元(含已宣告但尚未发放的现金股利120万元)取得一项股权投资,另支付交易费用20万元,划分为可供出售金融资产。2017年12月28日,收到现金股利120万元。2017年12月31日,该项股权投资的公允价值为42
5年前甲的年龄是乙的三倍,10年前甲的年龄是丙的一半,若用y表示丙当前的年龄,下列哪一项能表示乙的当前年龄?
逻辑老师将上逻辑课的一部分学生组成一个学习小组,学习小组的成员获得的平均分要比没有参加学习小组的学生高许多,所以参加学习小组能够提高学习成绩。上述推理基于以下哪项假设?
最新回复
(
0
)