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GRE阅读题目解析:生物改变栖息地

2017-01-09 12:53:00来源:网络

  GRE阅读题目解析:生物改变栖息地】GRE考试考什么?GRE阅读是重点。新东方在线GRE频道为大家带来GRE阅读题目解析:生物改变栖息地,答案见下一页,希望对大家GRE备考有所帮助。更多精彩尽请关注新东方在线GRE频道!

  查看全部:GRE阅读答案解析(汇总)

  GRE阅读题目解析:生物改变栖息地

  P4

  Many organisms are capable of altering their habitat significantly, sometimes limiting their own growth. The influence of the biological component of an ecosystem is often greater in fresh waters that in marine or terrestrial systems, because of the small size of many freshwater bodies. Many of the important effects of organisms are related to their physiology, especially growth and respiration. By their growth many species can deplete essential nutrients within the system, thus limiting their own growth or that of other species. Lund has demonstrated that in Lake Windermere the alga Asterionella is unable to grow in conditions that it itself has created. Once a year, in the spring, this plant starts to grow rapidly in the lake, using up so much silica from the water that by late spring there is no longer enough to maintain its own growth. The population decreases dramatically as a result. (147 words)

  7. It can be inferred from the passage that which of the followings is true about Asterionella plants in Lake Windermere?

  (A) They are not present except in early spring.

  (B) They contribute silica to the waters as they grow.

  (C) They are food for other organisms.

  (D) They form a silica-rich layer on the lake bottom.

  (E) Their growth peaks in the spring.

  8. Select the sentence in the passage that indicates certain causes of the alteration of organisms to their habitat.

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