首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
职业资格
Plants and animals that have been studied carefully seem to have built-in clocks. These biological clocks, as they are called, u
Plants and animals that have been studied carefully seem to have built-in clocks. These biological clocks, as they are called, u
admin
2015-04-27
83
问题
Plants and animals that have been studied carefully seem to have built-in clocks. These biological clocks, as they are called, usually are not quite exact in measuring time. However, they work pretty well because they are "reset" each day, when the sun comes up.
Do pigeons use their biological clocks to help them find directions from the sun? We can keep pigeons in a room lit only by lamps. And we can program the lighting to produce artificial "days", different from the day outside. After a while we have shifted their clocks. Now we take them far away from home and let them go on a sunny day. Most of them start out as if they know just which way to go, but choose a wrong direction. They have picked a direction that would be correct for the position of the sun and the time of day according to their shifted clocks.
It is known and experimented that homing pigeons can tell directions by the sun. But what happens when the sky is darkly overcast by clouds and no one can see where the sun is? Then the pigeons still find their way home. The same experiment has been repeated many times on sunny days and the result was always the same. But on very overcast days clock-shifted pigeons are just as good as normal pigeons in starting out in the right directions. So it seems that pigeons also have some extra sense of direction to use when they cannot see the sun.
Naturally, people have wondered whether pigeons might have a built-in compass—something that would tell them about the directions of the earth’s magnetic field. One way to test that idea would be to see if a pigeon’s sense of direction can be fooled by a magnet attached to its back. With a strong magnet close by, a compass can no longer tell direction.
To test the idea, a group of ten pigeons had strong little magnet bars attached to their backs. Another group carried brass bars instead which were not magnetic. In a number of experiments, both groups were taken away from home and let go. On sunny days none of the magnet-pigeons was fooled. They were just as good as the brass-pigeons in starting out in the right direction toward home. On cloudy, overcast days, however, with no sun the brass-pigeons chose the right direction, but the magnet-pigeons were in trouble. They later started out in different directions and acted completely lost.
What can be inferred from the passage about biological clocks?
选项
A、They are used by all plants and animals to tell time.
B、Pigeons’ biological clocks are regulated every day with the sunrise.
C、The built-in biological clocks cannot be changed.
D、They gradually developed as pigeons grow mature.
答案
B
解析
根据第一段中的"However,they work pretty well because they are“reset”each day.when the sun comes up.”与第二段的实验可推知B项正确。
转载请注明原文地址:https://kaotiyun.com/show/EcCv777K
本试题收录于:
英语学科知识与教学能力题库教师资格分类
0
英语学科知识与教学能力
教师资格
相关试题推荐
WhichofthefollowingcannotberegardedasafeatureofsuccessfulEnglishteacher?
Whichofthefollowingassumptionsaboutvocabularylearningcontradictsthemodernlanguageteachingtheories?
Thesenserelationofthefollowingpairofsentences(seeXandY)is______.X.MaryhasbeentoJapan.Y.MaryhasbeentoAsia
Althoughtheearliestfilmsincinemaweredoneintheshotwithoutanyediting,cuttingissofundamentaltothemediumthatit
WhichofthefollowingsetsofphoneticfeaturescharacterizestheEnglishphoneme?
Sociolinguistsstudyvarietiesoflanguageand,accordingly,willbeinterestedintheanalysisofallofthefollowingEXCEPT__
Whichofthefollowingwordsinboldispronouncedwithafallingtone?
Whichofthefollowingisanexampleofteachers’indirectcorrectivefeedback?
Ifthefunctionoflanguageislimitedtocommunication,thenanimals’callscanalsobecalledlanguage,butactuallytheyare
随机试题
在《始得西山宴游记》中,作者描写西山之高峻时所运用的表现方法是()
保证具有哪些法律特征。
阅读《断魂枪》中的一段文字,然后回答下列小题:夜静人稀,沙子龙关好了小门,一气把六十四枪刺下来;而后,拄着抢,望着天上的群星,想起当年在野店荒林的威风。叹一口气,用手指慢慢摸着凉滑的枪身,又微微一笑,“不传!不传!”这段文字的描写方法是什么?
CopernicuswasborninTorun,Poland,onFebruary19,1473.Littleisknownabouthisearlylifeexceptthathisfatherdiedwhen
细胞培养中采用薄膜滤器过滤除菌,最常用的滤膜孔径是
A.淀粉酶B.血清转氨酶C.谷氨酰基转肽酶D.血清碱性磷酸酶E.肌酸磷酸激酶对诊断心肌梗死最有意义的是()
无锡市鸿山和梅村乡还保存着泰伯墓和泰伯庙,常熟市虞山尚存仲雍墓。()
近日,“归真堂活熊取胆”成为媒体上最热门的话题之一,保护动物再次成为人们关注的对象。我国对珍贵、濒危的野生动物实行重点保护,那么,国家重点保护的野生动物分为()。
抗战胜利后,学校数量达到最高点的是
求幂级数的和函数f(x)及其极值.
最新回复
(
0
)