7.19分手失败 放狗

西瓜anita

阅读 第一个lele league那个 但是其实jj里没有题目 这个选的时候还是挺纠结
第二个地幔 jj里有
第三个 这个很长 而且都是一些看不懂的词汇 特别绕 好像是寄生 宿主 然后第二段 就说了一个plant。  然后就一直在绕怎么prey 怎么刺激 之类的。这个真的完全读不懂的 （有狗主今天也遇到这篇了的话 评论我下啊 我很想知道这篇到底在说啥。我去找之前jj也没找到
第四个 时间不够 没仔细看 好像是什么广告更吸引人眼光吧。  
后面时间真的不够啊啊啊啊答不完题 就乱选的

真的炒鸡迷我那个verbal 第三篇我觉得应该是比较高分的题库吧 然后我肯定错了很多 然后掉库。  但是逻辑我基本都读懂了 感觉还行。sc 不太确定 但是也选出来了。 但是最后分数真的好低啊 不懂不懂


求助大家 我这种阅读不好的 除了靠jj 如果每天练习的话都会有提高吗。之前都是每天做sc cr 但是没怎么做过rc  感觉rc很多题选不出来

奋斗的小答

Mark一下！               

billyisfragile!

Like any good parasite, the dodder seedling latches on to its host — an unfortunate tomato stalk, say, or a carrot top — and doesn’t let go. The dodder’s tiny shoot wraps around the plant and taps into it, stealing nutrients.

But dodder, which is such a pest that it has made the Agriculture Department’s list of the top 10 weeds, doesn’t rely on dumb luck to find a host. It has a nose for it.

Penn State researchers have discovered that the plant, Cuscuta pentagona, uses chemical cues from a host plant to grow toward it. A dodder seedling can even distinguish between wheat, which it ordinarily disdains, and tomato, a favorite.

Plants produce volatile chemicals that waft through the air, and it’s long been known that plant-eating insects use them to locate food sources. Less clear, said Mark C. Mescher, an assistant professor at Penn State, has been “whether neighboring plants are also receiving these cues.”

So Dr. Mescher, along with Consuelo M. De Moraes and Justin B. Runyon, grew dodder seedlings in the lab adjacent to a tomato plant, controlling for light and other factors that could affect the direction of growth. As reported in the journal Science, they found that although the shoots started growing in a typical rotating pattern, they eventually grew toward the tomato stalk.

The researchers also extracted the volatile chemicals from the tomato plants and found that the dodder shoots would grow toward the chemicals even in the absence of a plant.

While this was the first example of one plant directing its growth in response to volatiles from another, Dr. Mescher said, “we would expect it’s widespread among parasitic plants.” Parasites like dodder don’t photosynthesize, and they have a limited amount of nutrients in their seed, so a shoot must find a host quickly or it will die.

In determining why dodder shoots preferred tomato over wheat, the researchers found that one of the chemicals from wheat served as a repellent. And that, they said, offers hope for ways to fight dodder infestations. Spraying food plants with the repellent chemical, or genetically modifying them to produce the chemical on their own, may keep dodder from growing in their direction.

Fernee

楼主，你说的第三篇月度，内容是不是，tomato与dodder。
第一段关于dodder的寄生机制，有害程度，对美国农业损失。
第二段关于一个实验，发现dodder不受湿度、光线影响，是由于tomatoes的味道影响的，而impatiens与有这种成分。
第三段是说科学家继续研究tomatoes的味道，发现分解出来的7种味道有3种是吸引dodder过来寄生的，而wheat虽然也有这三种味道成分，但是wheat另外还有一种成分阻断了dodder的寄生，从而引出一种新方法去控制dodder和保护农业。
因为我在6.22机经看过这篇，不肯定是不是~
btw,一起加油~

西瓜anita

Fernee 发表于 2018-7-19 14:58
楼主，你说的第三篇月度，内容是不是，tomato与dodder。
第一段关于dodder的寄生机制，有害程度，对美国农 ...

不是的！因为没出现tomato。第一段我记得有个wasp 刚才查了是黄蜂的意思???

Josiepppp

感谢分享 想问第三篇阅读是不是：

说有种wasp爱把某种毛毛虫当做host，在里面产卵，然后过度讲植物的防御机制。
第二段是重点：刚开始说的传统植物都会直接放出有毒物质毒pest，but，这个被毛毛虫(host)咬的植物的机制很复杂。然后说到科学家做了个实验，说让螳螂咬plant只放出某种ordour，但是不放出某种招来wasp的物质。但是把毛毛虫吃植物时候得分泌物放到植物上就会招来wasp(经过一段时间后wasp才会被吸引过来)。

西瓜anita

Josiepppp 发表于 2018-7-19 17:18
感谢分享 想问第三篇阅读是不是：

说有种wasp爱把某种毛毛虫当做host，在里面产卵，然后过度讲植物的防御 ...

对对对 就是这个 你知道这是哪个库里的吗

Josiepppp

西瓜anita 发表于 2018-7-19 18:28
对对对 就是这个 你知道这是哪个库里的吗

【悦独】2.23起叁月悦独原始与考古（共52篇 3/20 23：05） - GMAT数学专区+考试交流  https://forum.chasedream.com/thread-1244135-1-1.html

里面有个黄蜂毛毛虫的那个

ziyuenlau

How Parasitic Wasps Find their Hosts

Besides recognizing odors from their caterpillar hosts, wasps also learn to identify compounds released by the plant on which the caterpillars feed

By James H. Tumlinson, W. Joe Lewis and Louise E. M. Vet

是这篇吗？

原文有出现laser这个词吗？

Lyon墨

Josiepppp 发表于 2018-7-19 17:18
感谢分享 想问第三篇阅读是不是：

说有种wasp爱把某种毛毛虫当做host，在里面产卵，然后过度讲植物的防御 ...

某树是如何靠招引寄生虫来防止其他昆虫的伤害。