2. 外语
  3. 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

admin2011-01-17  31
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.
According to the passage, the optical anatomy of Bythograea thermydron’s acquires which of the following features as it grows from larva to an adult? Ⅰ. A higher sensitivity to longer wavelengths of light Ⅱ. An enhanced ability to form images Ⅲ. A greater range of spectral absorbance
选项 A、Ⅰ only
B、Ⅱ only
C、Ⅰ and Ⅱ only
D、Ⅰ and Ⅲ only
E、Ⅰ,Ⅱ, and Ⅲ
答案A
解析
转载请注明原文地址:https://kaotiyun.com/show/46jO777K
本试题收录于： GRE VERBAL题库GRE分类
0

GRE VERBAL

GRE

相关试题推荐
随机试题
最新回复(0)