There is no consensus among researchers regarding what qualifies a substance as a pheromone. While most agree on a basic definition of pheromones as chemicals released by one individual of a species which, when detected by another individual of the same species, elicit a specific behavioral or physiological response, some researchers also specify (10) that the response to pheromones must be unconscious. In addition, the distinction between pheromones and odorants— chemicals that are consciously detected as odors---can be blurry, and some researchers classify pheromones as a type of odorant. Evidence that pheromone responses may not involve conscious odor perception comes from the finding that in many species, pheromones are processed by the vomeronasal (or accessory olfactory) system, which uses a special structure in the nose, the vomeronasal organ (VNO), to receive chemical signals. The neural connections between the VNO and the brain are separate from those of the main olfactory system, whose processing of odorants triggers sensations of smell. But while the VNO does process many animal pheromone signals, not all animal pheromones work through the VNO. Conversely, not all chemical signals transmitted via the VNO quality as pheromones. For example, garter snakes detect a chemical signal from earthworms—one of their favorite foods—via the VNO, and they use this signal to track their prey.
Q9: The primary purpose of the passage is to A.compare and contrast the waysin which the vomeronasal organand the main olfactory systernprocess chemicals. B.summarize the debate over therole the vomeronasal organ plays in odor perception
A.compare and contrast the waysin which the vomeronasal organand the main olfactory systernprocess chemicals. B.summarize the debate over therole the vomeronasal organ plays in odor perception C.present some of the issuesinvolved in the debate overwhat constitutes a pheromone D.propose a new definition ofpheromones based on recentresearch E.argue that pheromones should beclassified as a type of odorant
看到没人回答，我这个菜鸟来答下吧，仅供参考哦 应该是C 文章开头就说no consensus about pheromone,下面就是很多人不同的观点了都举了例子来说明. A compare错 B summarize错 D propose a new definition错 E should be classified as a type of odorant 可是一开始就说无定论 GWD的答案不准的,PREP的答案比较准
看到没人回答，我这个菜鸟来答下吧，仅供参考哦 应该是C 文章开头就说no consensus about pheromone,下面就是很多人不同的观点了都举了例子来说明. A compare错 B summarize错 D propose a new definition错 E should be classified as a type of odorant 可是一开始就说无定论 GWD的答案不准的,PREP的答案比较准
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发表于 2011-4-30 18:17:05
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