Contrary to the long-held belief that plants in the natural world are always in competition，new research has found that in severe environments adult plants help smaller ones and grow well as a result.
The research，led by Dr Rocio，studied adult and seedling （幼苗）plants in the ecological desert in the south-east of Spain.
Dr Rocio said， "If you're a seedling in a poor land — the top of a mountain or a sand hill，for example-and you're lucky enough to end up underneath a big plant，your chances of survival are certainly better than if you landed somewhere on your own.What we have found，which was surprising，is an established large plant，called a 'nurse'，protects a seedling；it also produces more flowers than the same plants of similar large size growing on their own."
Other benefits of nurse-seedling partnerships include that more variety of plants growing together can have a positive effect on the environment.For example，vegetation areas with nurse plants with more flowers might be able to attract higher numbers of pollinators（傳粉者）in an area，in turn supporting insect and soil life and even provide a greater range of different fruit types for birds and other animals.
"The biggest winner for this system of nursing a plant is biodiversity（生物多樣性），" Dr Rocio said. "The more biodiversity an area，the greater number of species of plants，insect life，mammals and birds，and the better the chances of long-term healthy functioning of the environment and ecosystems. " This system is win-win for adult and seedling plants in unfavorable environments.
The research is of value to those who manage and protect plants in tough environments.Most home gardeners and farmers plan to ensure their soil and conditions are the best they can be for plant growth，but the findings might be of value to those who garden in bare places.
（1）What is a common understanding of plants？ CC
A．They can help each other.
B．They can survive ill conditions.
C．They compete with each other.
D．They grow well on their own.
（2）What will happen to seedling plants if they grow under adult plants？ DD
A．They will produce more flowers.
B．They will die owing to competition.
C．They will make adult plants larger.
D．They will benefit from adult plants .
（3）Who will benefit from the new research？ BB
A．People studying organic farming.
B．People protecting plants on sand hills.
C．People wanting to change biodiversity.
D．People keeping more animals on the farm.
【考點(diǎn)】自然生態(tài)與環(huán)境保護(hù)；說明文．
【答案】C；D；B
【解答】
【點(diǎn)評(píng)】
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：2024/5/27 14:0:0組卷：0引用：1難度：0.5
相似題
-
1．假定英語課上老師要求同桌之間交換修改作文，請(qǐng)你修改你同桌寫的以下作文。文中共有10處錯(cuò)誤，每句中最多有兩處。錯(cuò)誤涉及一個(gè)單詞的增加、刪除或修改。
增加：在缺詞處加一個(gè)漏字符號(hào)（∧），并在其下面寫出該加的詞。
刪除：把多余的詞用斜線劃掉（\）。
修改：在錯(cuò)的詞下劃一橫線，并在該詞下面寫出修改后的詞。
注意：1.每處錯(cuò)誤及其修改均僅限一詞；2.只允許修改10處，多者（從第11處起）不計(jì)分。
Our school held an activity on last Sunday because it was "Earth Day".Hundred of students took part in it.I am one of them.First，the headmaster gave us a speech about how to protect earth—our home.Then we went hiking，this was about 15km.Although the hiking was very tired，none were left behind.It is no doubt that all of us like the activity.In the future，they will try hardly to protect the environment.We hope we will take part in more activity about caring about the globe.發(fā)布：2024/6/27 10:35:59組卷：0引用：1難度：0.5 -
2．Leading a sustainable （可持續(xù)的） lifestyle doesn't require you to have to make great changes to your home，and this kind of transformation doesn't have to be an exhausting exercise. （1）
Here are three of them.
（2）By using solar energy，you will make your home far more sustainable.Solong as there is the sun in the sky，the solar panels atop your house will catch the rays and then transform them into electricity.
Make changes to your water drinking habits.Have you ever thought about how many single-use plastic bottles you use a year？If you should ever perform such a count，you'd find yourself well into three figures，or maybe even four. （3）To be truly sustainable，you've to change your water drinking habits.
（4）More often than not，these types of straws are used only once before being got rid of and taking up valuable landfill space.
Reduce your transport emission （排放）.If you want to be a more sustainable traveller，you should seek to reduce the carbon emissions you produce by avoiding driving.Of course，avoiding motor vehicles entirely isn't always going to be a practical choice for you.There're，however，still things you can do to be more sustainable. （5）
You have the power to make a sustainable change to your lifestyle—take the above advice and don't waste it.
A．Turn to solar energy.
B．Avoid wasting valuable resources.
C．The best thing you can do is to cycle，walk，or run.
D．Two choices you have are sharing cars and taking public transport.
E．There're many easy and simple things you can do to be more sustainable.
F．Another change you can make in this instance is to stop using plastic straws.
G．Drinking water like this might be quick，easy and convenient，but it's not sustainable.發(fā)布：2024/10/27 14:30:2組卷：19引用：3難度：0.5 -
3．The Sixth Extinction（滅絕） Extinctions，where entire species are wiped out，are not unusual in our Earth's history.In fact，over 90 percent of all species that ever lived are now extjye.aict.In the last 500 million years，there have been five times when life on Earth has almost ended.These include the third mass extinction，known as the"Great Dying"，which killed 90% to 96% of all species.And the fifth event，which occurred 66 million years ago，caused the death of the dinosaurs.The reasons for extinctions are varied.According to scientists，they include volcanic eruptions，asteroids （小行星） hitting the Earth from space，changes in sea levels，the decrease of the oxygen content of the sea and global warming.Many scientists say we are now entering the Earth's sixth mass extinction.This time，human activity will be to blame.
Although it is not unusual for species to die out naturally，the rate at which this is now happening is cause for concern.A 2015 study by scientists who were based at Brown University and Duke University in the US，looked at how quickly species die out due to natural causes，that is，the "background extinction rate".They found that human activity is causing species to die out1，000 times faster than normal.There is a long list of reasons why so many species are dying out：air and water pollution，forests being destroyed，factory farming and overfishing.It is clear that human activity has negatively affected all other species on Earth，including animals and plants.
If a sixth mass extinction occurs，scientists who have studied the issue believe that up to three quarters of all species on Earth could die out.Of course，as we humans depend on so many species for our survival，we would also be at risk of dying out.Our world and our lives depend on the balance in nature between animals and plants.Without forests，we would have no air to breathe and without clean water we would be unable to survive.
Can a sixth extinction be avoided？Experts say that it is not yet too late，if we take action now.If we want to survive，we need to stop destroying the planet that we live on and start to protect it.
（1）What are the reasons for extinction in the history？
（2）Why does the writer believe we will probably die out if 3/4 of the Earth's species die out？
（3）Please decide which part is false in the following statement，then underline it and explain why.
It is not unusual for species to die out naturally，so we human beings are not to blame.
（4）What actions can we take to avoid the sixth extinction？ （In about 40 words）發(fā)布：2024/6/27 10:35:59組卷：3引用：1難度：0.5
把好題分享給你的好友吧~~