首页
登录
职称英语
[originaltext] Today, we are going to talk about a special way some plants r
[originaltext] Today, we are going to talk about a special way some plants r
游客
2025-02-09
29
管理
问题
Today, we are going to talk about a special way some plants respond to being invaded by pests. The plants react by emitting a chemical signal, which acts like a call for help. Let’s take corn plants for example. Sometimes, caterpillars chew on the corn leaves. When the caterpillar saliva mixes with the chew portion of a leave, the plant releases a chemical scream that attracts wasps. The wasps respond to the signal by flying to the chewed on leave, and laying their eggs on the caterpillars. The caterpillars die in the next few days as the wasp offspring nourish themselves by feeding of them. Thus the corn plant prevents all its leaves from being eaten by the caterpillars. This chemical scream is specific. It’s only released after the plant has detected the caterpillar saliva. A plant that is cut by in the other means does not give off the same signal, nor doesn’t undamaged plants. This also explains how a wasp can find a caterpillar in a huge field of corn. Soybean, cotton and probably many other plants use similar type of defense against pests. By enhancing this natural response in plants, researchers might reduce, some day even eliminate, the need for chemical pesticide, which can cause ecological damage. For example, scientists might breed plants for this screaming trait, or they might transplant specific genes to increase the release of the chemical signals.
选项
A、By flying in circles around a field
B、By detecting a chemical signal
C、By inspecting individual corn leaves
D、By noticing the caterpillar’s coloration
答案
B
解析
How can a wasp find a caterpillar on a corn plant?
转载请注明原文地址:http://tihaiku.com/zcyy/3949107.html
相关试题推荐
[originaltext]About200yearsago,theUnitedStateseconomywasgrowingqu
[originaltext]Today,wearegoingtocontinueourdiscussionofBuddhism.I
[originaltext]Today,wearegoingtocontinueourdiscussionofBuddhism.I
[originaltext]Today,wearegoingtocontinueourdiscussionofBuddhism.I
[originaltext]Today,wearegoingtocontinueourdiscussionofBuddhism.I
[originaltext]M:IamsorelievedIjustfinishedthestoryIwasworkingonfo
[originaltext]M:IamsorelievedIjustfinishedthestoryIwasworkingonfo
[originaltext]M:IamsorelievedIjustfinishedthestoryIwasworkingonfo
[originaltext]W:DrManning,doyouhaveafewminuets.I’dliketoaskyouabo
[originaltext]W:DrManning,doyouhaveafewminuets.I’dliketoaskyouabo
随机试题
Whichfacilitiesdothecollegeshave?ChooseFIVEanswersbelowandwritethec
EvidencesofHumanHistoryInthestudyofhumanhistory
Johnusedtogetupearly,______?A、usedheB、didheC、didn’theD、couldheC反意疑问
[originaltext]W:Whatdidyouthinkofthemovie?Didyoulikeit?M:Notreall
HowtheCIAWorks[A]DespiteplentyofHollywoodfilmsabouttheCIAand
我国为北京奥运会建筑的“鸟巢”,中间露天,四周有顶盖看台,外围及顶部采用型钢架,
钢管、钢板、钢带、紧固件、连接件的涂塑层厚度均为0.38mm。()
德国教育家第斯多惠说:“教育的艺术不在于传授知识,而在于唤醒,激发,鼓励。”这句
2012年全国国道网车流量较大的地区主要集中在北京、天津、上海、江苏、浙江、广东
设计教学法的提出者是( )。A.杜威 B.华虚朋 C.柏克赫斯特
最新回复
(
0
)