首页
登录
职称英语
[originaltext] Cultural controls are the oldest methods that have been used
[originaltext] Cultural controls are the oldest methods that have been used
游客
2024-04-30
24
管理
问题
Cultural controls are the oldest methods that have been used to manage pest populations. However, with the development of synthetic pesticides these controls were rapidly abandoned or de-emphasized and research on them was largely discontinued.(29)Today, we are going to talk about a natural 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,(30)a kind of insects that cannot fly chew on the com leaves; when this damage happens, the plant releases a chemical scream that attracts a kind of bees. The bees respond to the signal by flying to the chewed on leave, and laying their eggs on the insects.(31)The insects die in the next few days as the bees’ offspring will eat the insects. Thus the corn plant prevents all its leaves from being eaten by the insects. This chemical scream is specific. It’s only released after the plant has damaged by the insects. A plant damaged in other ways does not give off the same signal, nor does undamaged plants. Cotton and probably many other plants use similar type of defense against pests.(32)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.
29. What’s the main purpose of the talk?
30. What causes the corn plant to emit the chemical signal?
31. How do the bees protect the damaged corn plant?
32. What is the meaning of enhancing this natural response in plants?
选项
A、Insects chewing on its leaves.
B、Bees laying eggs on its leaves.
C、Pesticides sprayed on its leaves.
D、Knives cutting its stalk.
答案
A
解析
文章中提到,一种不会飞翔的昆虫会咀嚼玉米的叶子,当这种伤害出现时,植物就会释放一种化学信号吸引一种蜜蜂,故答案为A)。
转载请注明原文地址:https://tihaiku.com/zcyy/3577931.html
相关试题推荐
[originaltext]WestPointisacollegeforfutureArmyofficers.Ithasmore
[originaltext]WestPointisacollegeforfutureArmyofficers.Ithasmore
[originaltext]Likemanyworkingpeople,Ineveractuallycookanything—Iju
[originaltext]Likemanyworkingpeople,Ineveractuallycookanything—Iju
[originaltext]Likemanyworkingpeople,Ineveractuallycookanything—Iju
[originaltext]W:Canyoutellmealittlebitaboutyourcurrentproject?What
[originaltext]W:Canyoutellmealittlebitaboutyourcurrentproject?What
[originaltext]W:So,Matt,(19)we’retalkingaboutadjectivesthisweek,orqua
[originaltext]M:Comeon,Kate.Thesun’sshinning.Theflowersareblooming.M
[originaltext]M:Comeon,Kate.Thesun’sshinning.Theflowersareblooming.M
随机试题
Whenaconsumerfindsthatanitemsheorheboughtisinfaultyorin
Thelinkbetweenhealthandincomeseemsprettyuncontroversial.【C1】______al
电喇叭上共鸣片、膜片、衔铁及()刚性连为一体。A.上铁心 B.下铁心 C.
A.x轴 B.y轴 C.z轴 D.直线x=y=z
建筑施工企业管理人员安全生产考核包括全生产知识考核和()考核,A.安全生产技能
根据规模细分的各子市场中,商业银行应重点争取的客户群为( )。A.工业企业
小明用GoldWave软件截取一段背景音乐如下图所示,当前选定部分的音频长度为(
下列属于金融期货交易制度的有()。 ①.集中交易制度 ②.标准化的期货
关于判决和裁定,下列做法正确的是:() A.最高人民法院的判决和裁定是发生法
背景 某机电工程公司承接了一座110kV变电站建设项目,工期一年,时间紧、任务
最新回复
(
0
)