首页
登录
职称英语
Since the Hawaiian Islands have never been connected to other landmasses, th
Since the Hawaiian Islands have never been connected to other landmasses, th
游客
2025-04-21
13
管理
问题
Since the Hawaiian Islands have never been connected to other landmasses, the great variety of plants in Hawaii must be a result of the long-distance dispersal of seeds, a process that requires both a method of transport and an equivalence between the ecology of the source area and that of the recipient area.
There is some dispute about the method of transport involved. Some biologists argue that ocean and air currents are responsible for the transport of plant seeds to Hawaii. Yet the results of flotation experiments and the low temperatures of air currents cast doubt on these hypotheses. More probable is bird transport, either externally, by accidental attachment of the seeds to feathers, or internally, by the swallowing of fruit and subsequent excretion of the seeds. While it is likely that fewer varieties of plant seeds have reached Hawaii externally than internally, more varieties are known to be adapted to external than to internal transport. [br] The author mentions the results of flotation experiments on plant seeds most probably in order to ______.
选项
A、support the claim that the distribution of plants in Hawaii is the result of the long distance dispersal of seeds
B、lend credibility to the thesis that air currents provide a method of transport for plant seeds to Hawaii
C、suggest that the long-distance dispersal of seeds is a process that requires long periods of time
D、challenge the claim that ocean currents are responsible for the transport of plant seeds to Hawaii
答案
D
解析
作者提到植物漂浮实验结果,很可能是为了质疑洋流致使植物的种子被输送到夏威夷这一观点。生物学家们认为,海洋和气流是植物的种子被输送到夏威夷的主要原因,但漂浮实验以及气流低温实验结果对上述观点提出了质疑。
转载请注明原文地址:https://tihaiku.com/zcyy/4047074.html
相关试题推荐
SincetheHawaiianIslandshaveneverbeenconnectedtootherlandmasses,th
SincetheHawaiianIslandshaveneverbeenconnectedtootherlandmasses,th
SincetheHawaiianIslandshaveneverbeenconnectedtootherlandmasses,th
SincetheHawaiianIslandshaveneverbeenconnectedtootherlandmasses,th
Theremarkable______oflifeontheGalopagosIslandsinspiredCharlesDarwint
TheAleuts,residingonseveralislandsoftheAleutianChain,thePribilofI
TheAleuts,residingonseveralislandsoftheAleutianChain,thePribilofI
TheAleuts,residingonseveralislandsoftheAleutianChain,thePribilofI
TheAleuts,residingonseveralislandsoftheAleutianChain,thePribilofI
TheAleuts,residingonseveralislandsoftheAleutianChain,thePribilofI
随机试题
Shop-lifterscanbedividedintothreemaincategories;theprofessionals,
[originaltext]It’ssunnytoday.Whynotgooutforapicnic?[/originaltext][au
我军政治工作萌芽于( ),创立于建军之初。A.大革命时期 B.八七会议 C
央视《全球资讯榜》栏目有段广告:每天,我们只给你介绍三位全球热门人物;只报道最受
A.a=b/4 B.a=b/2 C.a=b D.a=2b
()平衡计分卡系统的视角与公司整个价值链的目标相关。A.财务 B.顾客
下列不属于政府引导基金特点的是( )。A.由政府出资 B.不以营利为目的
商业银行开展内部控制评价时,应当根据业务经营情况和风险状况确定内部控制评价的频率
关于混合性蛋白尿的特点,描述正确的是( )。A.有低相对分子质量及中相对分子质
我国疟疾的主要传播媒介A.三带喙库蚊B.中华按蚊C.背点伊蚊D.白纹伊蚊E.刺扰
最新回复
(
0
)