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
外语
Traffic fumes render the scent of flowers barely recognizable to honeybees and could have a serious impact on their ability to f
Traffic fumes render the scent of flowers barely recognizable to honeybees and could have a serious impact on their ability to f
admin
2017-11-08
29
问题
Traffic fumes render the scent of flowers barely recognizable to honeybees and could have a serious impact on their ability to find food, new research has found. Scientists discovered that reactive pollutants in diesel (柴油) destroyed key chemicals in the odour of oilseed flowers making them smell different to the bees.
"Honeybees have a sensitive sense of smell and an exceptional ability to learn and memorize new odours," said Tracey Newman, a neuroscientist at the University of Southampton. "The effect of diesel fumes on flower scent could have serious detrimental effects on the number of honeybee colonies and pollination (授粉) activity." Three-quarters of the world’s food crops rely on bees and other natural pollinators " Pollinator services are crucial to humankind," said Newman.
But there have been serious declines in natural pollinators in recent decades. A combination of factors is blamed, including the huge loss of the flower-rich habitats that sustain bees, as well as disease, and the impact of agricultural insecticides. The revelation that traffic fumes could be adding to the problems is significant, said Guy Poppy, a professor and ecologist at Southampton, who also worked on the research. He said, "Diesel exhaust is not the root of the problem, but clearly, with all the other stressors, adding another one is likely to be detrimental to bee health."
The study, published in the journal Scientific Reports, tested bees’ ability in the laboratory to recognize the aroma of oilseed rape flowers. Bees were strapped down and taught to associate floral scents with food in the form of sugar solutions. Once the bees learned the connection they began sticking their tongues out in anticipation of food even if it was not offered—an indication that they recognized the smell. When the scent was presented without pollutants the bees recognized it 98% —99% of the time. But after the scent was mixed with levels of diesel exhaust matching those found at roadsides, the bees only recognized it 30% of the time.
Which of the following is not the reason for the decline of natural pollinators?
选项
A、A large amount of the flower production places disappear.
B、Heavy use of agricultural insecticides.
C、Traffic fumes pollute the atmosphere.
D、Decline on the number of honeybee colonies.
答案
D
解析
根据题干可以将该题定位至第三段。第三段指出了自然授粉活动次数严重下滑的原因:多花蜜蜂栖息地数量的减少;疾病和农业杀虫剂的影响;交通废气,所以很容易排除A、B和C选项。
转载请注明原文地址:https://jikaoti.com/ti/J8UFFFFM
0
大学英语四级
相关试题推荐
A、Themanshouldtakeherwordsseriously.B、Sheisregretfulthemanrecoverstooslowly.C、Themanshouldnotdrinkmuchwhen
Designingforsustainability:whatarethechallengesbehindgreenmaterials?A)LearningtosurfinCalifornia’sicybreakers,T
Designingforsustainability:whatarethechallengesbehindgreenmaterials?A)LearningtosurfinCalifornia’sicybreakers,T
Designingforsustainability:whatarethechallengesbehindgreenmaterials?A)LearningtosurfinCalifornia’sicybreakers,T
Designingforsustainability:whatarethechallengesbehindgreenmaterials?A)LearningtosurfinCalifornia’sicybreakers,T
A、Thehouse-sitterlooksaftertheowner’shousecarefully.B、Thehomeownersdon’twanttomakeafuss.C、Thehouse-sittermakes
Theownershipofpetsbringsavarietyofbenefitsthattheuninitiatedwouldneverbelieve.Foreverytaleofshreddedcushion,
A、Whenthepricefelltoitslowestlevel.B、Whengoldpricesreachedinvestors’settargets.C、Whenlotsofphysicalgoldwasc
A、Theyrepaveditwithrocks.B、Theybeautifieditwithplants.C、Theybuiltpublicrestroomsonit.D、Theysetupcookingfacil
随机试题
A.健脾养心,补益气血B.健脾养心,理气化痰C.行气开郁,化痰散结D.疏肝解郁,理气畅中E.清肝化痰,疏肝解郁郁证中,肝气郁结的常用治法是()。
某设计方案年产量为12万吨,已知每吨产品的销售价格为650元,每吨产品缴纳的税金为65元,单位可变成本为250元,年总固定成本为1500万元。则以单位产品可变成本表示的盈亏平衡点为()元/吨。
容易造成股利支付额与本期净利相脱节的股利分配政策是( )。
陶行知说:“教师必须具有健康的体魄,农人的身手,科学的头脑,艺术的兴味,改革社会的精神。”这体现了教师职业劳动的()。
近年来,全国各地相继启动了高考制度改革,新高考更注重考查学生的综合素质,内容主要包括思想品德、学业水平、身心健康、艺术素养、社会实践5个方面。但据调查,我国城乡教育发展不均衡,很多农村学校的素质教育无法到位,农村孩子在新高考综合素质测评中容易处于劣势地位。
文化体制改革重点任务基本完成,是2015年我国文化改革发展的目标之一。()
A.That’sright,John.B.Whyshouldwebelieveyouthistime?C.ButMrs.Faulkes,yousaidthatfiveyearsagowhenyouwerec
俗话说:“买卖不在仁义在”,请运用合同的基本原则和合同法的相关理论知识对其加以辨析。
某一市长曾建议向进城的私人车辆每天收取五美元的费用,宣称这种费用的征收将缓解该城市的交通拥挤状况。该市长解释说,由于该费用比许多附近站点乘坐环线公共汽车的费用要高,许多人会由自己驾驶汽车转为乘坐公共汽车。以下哪项陈述为证明该市长的推理是有缺陷的提供了最好的
The"paperlessoffice"hasearnedaproudplaceonlistsoftechnologicalpromisesthatdidnotcometopass.Surely,though,th
最新回复
(
0
)