首页
登录
职称英语
Hydrothermal vents along the mid-ocean ridges host ephemeral ecosyst
Hydrothermal vents along the mid-ocean ridges host ephemeral ecosyst
游客
2025-02-22
27
管理
问题
Hydrothermal vents along the mid-ocean ridges host ephemeral ecosystems
of diverse fauna, including several crustacean species, some of which undergo
development as larvae up to 1,000 meters above and 100 kilometers away from
Line the vents. For example, vent crab Bythograea thermydron (at stage of
(5) larvae) possess image-forming compound eyes with a visual pigment sensitive to
the blue light of upper oceanic waters. As these larvae metamorphose into
adulthood and begin to descend to and settle at the vents, they lose their image-
forming optics and develop high-sensitivity naked-retina eyes. With maturation,
the spectral absorbance of the visual pigment in these eyes also shifts towards
(10) longer wavelengths and this progressive visual metamorphosis trades imaging
for increased sensitivity, and changes spectral sensitivity to the dim, longer
wavelengths of light existing at the bottom of the ocean. As hydrothermal vents
produce light, vision may supplement thermal and chemical senses to orient
post-larval settlement at vent sites. [br] It may be inferred from the passage that the larval environment which surrounds the vent crab Bythograea thermydron differs from its adult environment in that it
选项
A、contains more thermal vents than the adult environment
B、receives more of its light from the sun than from hydrothermal vents
C、lacks the longer and dimmer wavelengths of light found in the adult environment
D、can be survived only by creatures equipped with image-forming optics
E、has a tendency to induce metamorphoses in the creatures that occupy it
答案
B
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/3968415.html
相关试题推荐
Hydrothermalventsalongthemid-oceanridgeshostephemeralecosyst
Hydrothermalventsalongthemid-oceanridgeshostephemeralecosyst
Creatingarelativelysimplemodeloftheknownecosystemrequiresatremendous
Althoughplantandanimalspeciesthatbecomeestablishedinecosystemswhereth
Someecosystemsaremore(i)______thanothers,betterabletowithstandchanges,
Aninfluentialearlyviewheldthatecosystemscontainnichesforalimitednumb
Onewaytopredicttheeffectsofglobalclimatechangeonanecosystemistoex
Marineecosystemscertainlyhavelesspermanencethanterrestrialecosystems
Ourterrestrialfoodsupplycomesfromecosystemstransformedtoproduceaf
TheassumptionthatthetropicalecosystemofAmazoniahasbeencreatedsolelyb
随机试题
我们现在面临的所有重大世界性问题中最重要的问题就是人口对土地和土地资源的压力正存迅速增长。Themostimportantprobleminallm
Accordingtoapanelofhealthofficials,therehasbeenagreatdealofconfusi
[img]2018m1x/ct_eyyjsaz2017c_eyyjsacloze_0016_201712[/img]Ahundredyearsa
HowtoDevelopanOutlineⅠ.ApreliminaryoutlineA.De
[originaltext]M:ThisTVsetisgettingworseandworse.Nowitdoesn’tworkat
Doyoumindmy____thewindow?( )A.op
黄疸在出生后24小时内出现者应首先考虑A、新生儿溶血症 B、新牛儿肝炎 C、
根据下列文字回答问题。 2005年,上海市生产总值为9143.95亿元,
我国2011年政府消费支出总额约为多少亿元?() A.22858 B.6
废水处理构筑物中调节池的作用是( )。A.调节水位高低 B.降解污染物 C
最新回复
(
0
)