Ithappenseveryspring.Flowersco-查字典问答网
分类选择

来自范玉军的问题

  Ithappenseveryspring.Flowerscomeouteverywhereonthesameday.Buthowdoplants"know"whentoflower?Foryears,ithasbeenadifficultquestionforscientists.ButaUSresearchgroupmayhavefinallyansweredit-thesecretli

  It happens every spring.Flowers come out everywhere on the same day.But how do plants"know"when to flower?

  For years,it has been a difficult question for scientists.But a US research group may have finally answered it-the secret lies in a protein(蛋白质)called FKF1.This helps plants to know when the days become long and when they get short.Then they can tell the seasons are changing.

  Researchers found the FKF1protein when they were studying a plant called Arabidopsis(拟南芥).It is sensitive(敏感的)to sunlight,and can be made active by sunlight.

  Plants produce this protein every day in the late afternoon all year.If there is no light at this time,for example in winter when the sun goes down early,the protein won't be active.But when spring comes and the days get longer,the FKF1protein can be made active by day light and the plants"know"it is time to flower."If there is light in the late afternoon,plants will know that the days are getting longer and that it is the best time for flowers to come out,"explained Takato Imaizumi,leader of study.But when conditions are poor for growing,such as during autumn or winter when the weather is cold and days are short,plants won't flower.

  Although researchers have only studied how the FKF1protein works in the Arabidopsis,they believe that it is the same with many other plants,including crops such as rice and wheat.This could be useful to the agricultural industry.

  "If we can control when flowers come out,we might be able to increase crop production,"Imaizumi said.

  38.The passage is mainly about___.

  A.how plants"know"when to flower

  B.what people can do with plants

  C.how seasons are changing

  D.what kind of plant Arabidopsis is

  39.Scientists found the FKF1protein when they were___.

  A.answering a question

  B.controlling the clours of flowers

  C.planting flowers in the

1回答
2020-05-22 12:09
我要回答
请先登录
万坤华

  38.A 推理判断题 根据"But how do plants"know"when to flower?"可知,这篇短文主要介绍了花儿是怎么知道什么时候开放的,故答案为A

  39.D 细节理解题 根据"Researchers found the FKF1protein when they were studying a plant called Arabidopsis"可知,科学家是在研究拟南芥的时候发现的这种蛋白质,故答案为D

  40.B 细节理解题 根据"If there is light in the late afternoon,plants will know that the days are getting longer and that it is the best time for flowers to come out"可知,白天变长的时候是开花的最好时间,故答案为B

  41.A 推理判断题 根据"Although researchers have only studied how the FKF1protein works in the Arabidopsis,they believe that it is the same with many other plants"可知,科学家相信其他植物也跟拟南芥一样知道什么时候开花,故答案为A

2020-05-22 12:11:00

最新问答

推荐文章

猜你喜欢

附近的人在看

推荐阅读

拓展阅读

  • 大家都在看
  • 小编推荐
  • 猜你喜欢
  •