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Hydrothermal vents along the mid-ocean ridges host ephemeral ecosystems of diverse fauna, including several crustacean spe
Hydrothermal vents along the mid-ocean ridges host ephemeral ecosystems of diverse fauna, including several crustacean spe
admin
2011-01-17
46
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.
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
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本试题收录于:
GRE VERBAL题库GRE分类
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GRE VERBAL
GRE
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