首页
登录
职称英语
We tend to think of memory as unique to animals. But it isn’t. Plants also h
We tend to think of memory as unique to animals. But it isn’t. Plants also h
游客
2024-05-02
32
管理
问题
We tend to think of memory as unique to animals. But it isn’t. Plants also have a form of memory. Yes: they, too, are shaped by what happens to them, and alter their responses to future events based on their experiences in the past.
For example, like all plants, wild tobacco,(also called Nicotiana sylvestris)can’t move to escape from its enemies—the caterpillars(毛虫)and other animals that enjoy eating its leaves. It can, however, act to stop them. It can detect damaged leaves; in response, it produces nicotine. The nicotine travels from the roots, through the sap(树液)and into the leaves. Nicotine apparently doesn’t taste good: caterpillars fed on leaves from plants that recently experienced damage—and so are high in nicotine—eat much less than caterpillars fed on leaves from previously undamaged plants.
But here’s the interesting part. Tobacco plants attacked for the first time take longer to mount their defense than tobacco plants that have previously experienced an attack. This isn’t because the previously attacked plants keep on producing a higher level of nicotine—they don’t. Nicotine is expensive for a plant to make, so they only do it when necessary. And plants that have been attacked twice are faster to respond than plants that have only been damaged once. Somehow, they remember.
The physical basis of plant memory is still being figured out. Of course trees don’t have conscious memory. But by now it’s clear that wild tobacco is not the only plant with the capacity for memory, nor is caterpillar attack the only stress that produces such an effect. Drought, cold and altered salt levels in the soil all do so; likewise, exposure to bacteria.
If plants remember—can they also forget? As far as I can tell, no one knows the answer to this yet. Nor does anyone know how many different kinds of stresses a plant can keep track of at once. But the subject is important, as the stresses plants are exposed to can affect how well they grow. Being able to prime them to respond to pests, or enable them to forget about a drought, could have big implications for agriculture. [br] Wild tobacco can detect damaged leaves and ______ in reaction to prevent caterpillars from eating its leaves.
选项
答案
produce nicotine
解析
题干中的in reaction对应文章第2段第3句中的in response,故其后的内容为答案。注意填入的动词应与前面的detect相对应,为动词原形。
转载请注明原文地址:https://tihaiku.com/zcyy/3581145.html
相关试题推荐
Americancultureisrich,complex,andunique.Itemergedfromtheshortand
Americancultureisrich,complex,andunique.Itemergedfromtheshortand
Americancultureisrich,complex,andunique.Itemergedfromtheshortand
RecoveringMemory:CanaNewDeviceHelpAmnesia(健忘症)Patients?Cla
RecoveringMemory:CanaNewDeviceHelpAmnesia(健忘症)Patients?Cla
RecoveringMemory:CanaNewDeviceHelpAmnesia(健忘症)Patients?Cla
RecoveringMemory:CanaNewDeviceHelpAmnesia(健忘症)Patients?Cla
RecoveringMemory:CanaNewDeviceHelpAmnesia(健忘症)Patients?Cla
RecoveringMemory:CanaNewDeviceHelpAmnesia(健忘症)Patients?Cla
RecoveringMemory:CanaNewDeviceHelpAmnesia(健忘症)Patients?Cla
随机试题
Heissuchamanwhoisalways______faultwithotherpeople.A、puttingB、seeking
[audioFiles]audio_ehbm_j27002(20082)[/audioFiles]A、Sheisverynice.B、Sheisu
Topicsforcompositionshouldbe______totheexperiencesandinterestsofthes
使用程序设计的控制结构导出测试用例的测试方法是()。A.黑盒测试 B.白盒测
某非抗震设计的单层钢结构平台,钢材均为Q235B,梁柱均采用轧制H型钢,X向采用
下列哪项是上消化道呕血且不易控制的疾病A.胃癌晚期 B.急性胃肠炎 C.消化
肝癌患者术前肠道准备中,口服新霉素的主要目的是A:减轻腹压 B:增加肠蠕动
为防止()过电压烧损电压互感器,倒闸操作时,不宜使用带断口电容器的断路器投切带电
房地产投资中,若甲项目每年的净现金流量为乙项目相应年份净现金流量的2倍,通过分别
出现下列情况时,不需要修订基本标准成本的是()。A.产品的物理结构发生变化 B
最新回复
(
0
)