[img]2018m9s/ct_etoefz_etoeflistz_201808_0053[/img] [br] What features of disrup

游客2024-01-03  15

问题 [br] What features of disruptive crypsis does the professor mention? Click on 2 answers.
Listen to part of a lecture in a biology class.
Professor: In the animal kingdom, camouflage is a common strategy to avoid predation. There are many examples. The most famous might be the chameleon, a lizard that can change its skin color to match its surroundings, but there are also insects that look like leaves or flowers, frogs that look like rocks. I’m sure you could think of a dozen more examples. First of all, let me introduce a technical term that’s often used for camouflage, and that’s "crypsis."
    When we examine crypsis in the animal kingdom, it may appear that there are a thousand different patterns animals use to hide from predators. However, recent research involving cephalopods is teaching us there is actually less there that meets the eye.
    Squid, octopus, and cuttlefish are cephalopods, and they are uniquely suited for crypsis research because individual animals don’t have a fixed coloration. They actually can very quickly change the appearance of their skin to match almost any habitat. Cephalopods can produce up to 50 different colors, patterns and textures, but what the research is showing is that all these patterns employed by the cephalopods are variations on just three basic types of crypsis.
    The first is uniform or stipple. The word "stipple" is taken from visual arts. It means making small dots to create the impression of a solid color. Anyway, uniform or stipple body patterns are used by cephalopods to match their skin color to fairly uniform backgrounds like the sandy sea bottom. A sandy sea bottom has one basic color with little variation, so an octopus would only need to change its skin color to one basic color to match the environment.
    When a cephalopod needs to blend into a non-uniform, a more varied background, like gravel, which is made up of small rocks of various sizes and colors, the cephalopods choose a mottled body pattern. Mottled body patterns consist of alternating, irregularly shaped dark and light patches in the skin that roughly match the size of the dark and light objects in the immediate area.
    And finally, cephalopods also use what’s called "disruptive coloration." Disruptive body patterns are irregular patches of different shapes and colors that serve to distract an observer’s attention and obscure the outline or true shape of the animal. In other words, a disrupted pattern makes it difficult the shape and size of the animal. Disruptive patterns can also achieve some level of general resemblance to the background. That is, they often contain small regions with mottled patterns or even uniformity. Cephalopods will adopt this crypsis strategy when the background is irregular and contains relatively large and irregular patches of colors and textures.
    You may be asking yourselves why studying cephalopod crypsis is important. Well, while evolution has produced a wide variety of body colorations and patterns in the animal kingdom, the basic pattern types we’ve observed in cephalopods are used throughout the animal kingdom and ecological habitats, and that goes not just for animals that can change their cryptic pattern, but also for animals that have just one cryptic pattern they cannot change. You could also come to the conclusion that these are same basic strategies used by the chameleons, frogs and insects we talked about, and by larger animals as well. For example, the tiger’s pattern of black strips on a lighter background is a form of disruptive coloration.

选项 A、It is most effective when used against a single-colored background.
B、It can incorporate a combination of other crypsis patterns.
C、It disguises the outline of the animal that uses it.
D、It works by contrasting with the colors in the surrounding habitat.

答案 B,C

解析 细节题。在解释disruptive body pattern混隐色的作用、过程时,教授具体解释道:a disrupted pattern makes it difficult the shape and size of the animal.即可以起到分散观察者注意力和模糊动物外形的作用,因此C选项是正确答案。教授接着解释说:That is,they often contain small regions with mottled patterns or even uniformity.即该方法包含模仿斑驳和单一模式,因此B选项是正确答案。适合单一颜色的背景的是第一种隐蔽方法uniform or stipple body patterns,因此A选项不正确。D选项表述与原文中achieve some level of general resemblance to the background相反。
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