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
2024-01-11
43
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://tihaiku.com/zcyy/3353853.html
相关试题推荐
Tropicalbatsplayanimportantroleintherainforestecosystem,aidinginthe
Hydrothermalventsalongthemid-oceanridgeshostephemeralecosyst
Creatingarelativelysimplemodeloftheknownecosystemrequiresatremendous
Althoughplantandanimalspeciesthatbecomeestablishedinecosystemswhereth
Sincecodfishare(i)______partofthemarineecosystem,their(ii)______woulda
By(i)______manyaspectsofnaturalriverecosystems,somedamscauseseriousha
Someecosystemsaremore(i)______thanothers,betterabletowithstandchanges,
Onewaytopredicttheeffectsofglobalclimatechangeonanecosystemistoex
Marineecosystemscertainlyhavelesspermanencethanterrestrialecosystems
Ourterrestrialfoodsupplycomesfromecosystemstransformedtoproduceaf
随机试题
TheEnglishpoet______isbestknownforhisworksTheCanterburyTales.A、Willi
SolarPowerThesunis【T1】______.It【T2】______.Peoplehavecreateddiff
WilkinsMicawberisacharacterinthenovel______,aneternaloptimistwho,de
中国居民营养调查中每次膳食调查的时间应不少于A.4天 B.3天 C.5天
患者女性,81岁,退休干部。冠心病住院治疗,住院前3天与护士们关系融洽。第4天,
图中的文字与哪个历史人物所处时期最为接近? A.武则天 B.王昭君 C.西
儿童能以命题形式思维,则其认知发展已达到( )。A、感知运动阶段 B、前运算
商品归类题 牛骨制成的梳妆用梳子(2002年)()
纳税人的下列行为中,应当按纳税人同类应税消费品的最高销售价格作为计税依据计征消费
酵(臭)米面食物中毒的病原物质为A.外毒素 B.米酵菌酸 C.组胺类物质
最新回复
(
0
)