試卷征集
加入會員
操作視頻
There are many gardening tips.Some suggest playing music for your houseplants,having conversations with them,or even giving them a gentle touch now and then.Most of these practices are probably more for the benefit of the gardener than the garden,and generally harmless enough but except the last one.Your plants really dislike it when you touch them.
   A new study out of the La Trobe Institute for Agriculture and Food has found that most plants are extremely sensitive to touch,and even a light touch can significantly stunt(阻礙) their growth. "The lightest touch from a human,animal,insect,or even plants touching each other in the wind,can cause a huge gene response in the plant," Jim Whelan,who led the new study,said. "Within 30 minutes of being touched,10% of the plant's genome(基因組) is changed.This involves a huge expenditure(消耗)of energy which is taken away from plant growth.If the touching is repeated,then plant growth is reduced by up to 30%."
   Whelan and his team are still trying to find out why plants respond,at the genetic level,so strongly.They do have some theories,however.We know that when an insect lands on a plant,genes are activated(激活) preparing the plant to defend itself against being eaten," said Dr.Yan Wang,co-author of the study.
   Until more research is done,it's just a guess at this point.Still,the findings might already lead to new methods for how agriculturalists deal with their crops,to best promote healthier growth.
   It's worth noticing that while the study found that plants often respond to just a single touch in negative ways,it's really repeated touching that causes lasting stunted growth.That's because the plants are looking for patterns in the touching,to tell harmful touch from random touch.So it doesn't matter if you accidently brush up against a bush during a walk through the woods.

(1)How is the passage mainly developed?
D
D

A.By comparing
B.By giving examples
C.By listing numbers
D.By showing results of studies
(2)Why can touching stunt a plant growing according to the study?
A
A

A.It leads to the plant's energy expenditure.
B.It makes the plant sensitive to threats.
C.It causes a genetic disorder in the plant.
D.It prevents the plant absorbing nutrients.
(3)What's the importance of the study by Whelan and his team?
B
B

A.It gives us more useful gardening tips.
B.It helps find ways to ensure plants' healthy growth.
C.It contributes to the further study on genes.
D.It uses data to warn people not to touch plants.
(4)What is the passage mainly about?
C
C

A.Something is done to help plants grow.
B.Plants' genome can be changed easily.
C.Plants don't really like to be touched.
D.What we do every day may destroy plants.
【考點】科普知識說明文
【答案】D;A;B;C
【解答】
【點評】
聲明:本試題解析著作權(quán)屬菁優(yōu)網(wǎng)所有,未經(jīng)書面同意,不得復(fù)制發(fā)布。
發(fā)布:2024/4/20 14:35:0組卷:14引用:3難度:0.5
相似題
  • 1.A joint research team recently have developed a new electronic skin that is similar to human skin in strength,durability(耐久性) and sensitivity.The skin or e-skin may play an important role in next-generation personalized medicine,soft robotics and artificial intelligence.
       "The ideal e-skin will mimic(模仿) the many natural functions of human skin,such as sensing temperature and touch,accurately and in real time," says leading researcher Yichen Cai.However,making suitably flexible electronics that can perform such delicate tasks while also used repeatedly is challenging,and each material involved must be carefully engineered.
       Most e-skins are made by putting an active sensor on the surface that attaches to human skin.However,the connection between them is often too weak,which reduces the durability and sensitivity of the material;otherwise,if it is too strong,it won't be flexible enough,making it more likely to break the circuit.
       "The landscape of skin electronics keeps shifting at a remarkable pace," says Cai. "The discovery of 2 D sensors has accelerated efforts to turn these quite thin but strong materials into functional,durable artificial skins."
       The new man-made skin built by the researchers could sense objects from 20 centimeters away.It could further make a quick response when touched in less than one tenth of a second. " It is a striking achievement for an e-skin to maintain toughness after repeated use," said Shen, "which mimics the softness and rapid recovery of human skin."
       This type of e-skin could monitor a range of biological information,such as changes in blood pressure,which can be detected from movements of arms and legs.This data can then be shared and stored on the cloud via Wi-Fi.
       "One remaining problem to the widespread use of e-skins lies in mass production of high-resolution sensors," adds group leader Vincent Tung "however,the latest technology offers new promise. "

    (1)What's the feature of the new e-skin?

    A.It can store information.
    B.It's quite hard and tough.
    C.It's flexible and sensitive.
    D.It can replace human skin.
    (2)Why does the author mention "most e-skins" in paragraph 3?

    A.To stress the challenges of making e-skins.
    B.To introduce the popularity of e-skins.
    C.To show the process of making e-skins.
    D.To compare the similarity between e-skins.
    (3)What can the new e-skin do?

    A.Adjust the blood pressure.
    B.Recover the wounded skin.
    C.Work as a remote controller.
    D.Sense the outside temperature.
    (4)What is the best title for the text?

    A.A Breakthrough in Hi-tech
    B.Man-made Skin,Improved
    C.E-skin,A Promising Business
    D.The Widespread Use of E-skin
    發(fā)布:2024/7/16 8:0:9組卷:9引用:3難度:0.5
  • 2.Scientists,psychologists and English academics at Liverpool University have found that reading the works of the classical writers like Shakespeare and Wordsworth has a great effect on the mind,catches the reader's attention and triggers moments of self-examination.
       Using a special machine,they monitored the brain activity of 30 volunteers as they read works by William Shakespeare,William Wordsworth,T.S.Eliot and others.
       In the first part of the research,the brain activity of 30 volunteers was monitored as they read passages from Shakespeare's plays,including King Lear,Othello,Coriolanus and Macbeth,and again as they read the text rewritten in a simpler form or modern language.
       While reading the common texts,normal levels of electrical activity were shown in their brains.When they read the works of Shakespeare,however,the levels of activity jumped because of his use of words which were unfamiliar to them.The result of the test showed that the more challenging passages cause a greater degree of electrical activity in the brain than the common ones.
       Scientists went on to study the brain activity as it responded to each word and recorded how it lit up as the readers came across unusual words,surprising phrases or difficult sentences in the classical works.As a result,this lightening up process of the mind lasted longer than that when volunteers read common texts,encouraging further reading.
       The research also found that reading poetry especially increases activity in the right hemisphere(半球) of the brain,an area connected with "autobiographical memory",driving the readers to think carefully about their own experiences based on what they have read.The academics said this meant the classical works of literature are more useful than self-help books.
       Philip Davis,an English professor who has worked on the study in the university's magnetic resonance center,announced this week: "Classical literature acts like a rocket-booster to the brain,which provides extra power for the brain.You may never imagine how powerful it is.The research shows such kind of literature can create new thoughts and connections in the young and the old."

    (1)The underlined word "trigger" in Paragraph 1 is closest in meaning to "
    ".
    A.depends on
    B.picks up
    C.sets off
    D.changes into
    (2)Which of the following is NOT true about reading classical literature?

    A.It makes readers' brain more active than reading common texts.
    B.It makes readers' electrical activity of brain return to normal.
    C.It's helpful for readers to come up with new ideas.
    D.It's an activity that is suitable for people of all ages.
    (3)From the research,we can learn that

    A.the readers prefer Shakespeare's works to the other writers' works
    B.the words of classical works make it hard for volunteers to read further
    C.reading classical works produces a good and long-lasting effect on the mind
    D.poetry increases left-brain activity more than other literary forms
    (4)What does the author mainly tell us in this passage?

    A.Shakespeare's plays deserve to be read.
    B.Common books are unpopular anymore.
    C.Poetry is best for developing people's brain.
    D.Classical works help the brain develop better.
    發(fā)布:2024/7/12 8:0:9組卷:1引用:1難度:0.7
  • 3.
    A.putting B.since C.danger D.as E.taking care of F.safety
    Do animals feel love?Maybe.Maybe not.There're many signs of animal love in nature.Or,at least,there seem to be.They include mothers(1)
    their babies,or even family groups protecting one another from(2)
    .One scientist has made a discovery (發(fā)現(xiàn)).The brains of some animals produce chemicals that are seen in human brains.In our brains,these chemicals are responsible (負(fù)責(zé)的) for the feeling of love.But some scientists doubt (懷疑) that animals really"feel" love.They say that we're just(3)
    our own feelings on the animals.We expect animals to love and protect their young babies(4)
    we do.But these scientists say animals do these things without any reasons.They say animals have no feelings.They only have natural behaviours(5)
    they were born.
    發(fā)布:2024/8/8 8:0:9組卷:0引用:0難度:0.5
小程序二維碼
把好題分享給你的好友吧~~
APP開發(fā)者:深圳市菁優(yōu)智慧教育股份有限公司 | 應(yīng)用名稱:菁優(yōu)網(wǎng) | 應(yīng)用版本:4.8.2  |  隱私協(xié)議      第三方SDK     用戶服務(wù)條款廣播電視節(jié)目制作經(jīng)營許可證出版物經(jīng)營許可證網(wǎng)站地圖本網(wǎng)部分資源來源于會員上傳,除本網(wǎng)組織的資源外,版權(quán)歸原作者所有,如有侵犯版權(quán),請立刻和本網(wǎng)聯(lián)系并提供證據(jù),本網(wǎng)將在三個工作日內(nèi)改正