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GRE阅读题目解析:真菌感染的植物

2017-03-23 09:54:00来源：网络

　　【GRE阅读题目解析:真菌感染的植物】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:真菌感染的植物，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:真菌感染的植物

　　P3

　　Mycorrhizal fungi infect more plants than do any other fungi and are necessary for many plants to thrive, but they have escaped widespread investigation until recently for two reasons.

　　First, the symbiotic association is so well-balanced that the roots of host plants show no damage even when densely infected.

　　Second, the fungi cannot as yet be cultivated in the absence of a living root.

　　Despite these difficulties, there has been important new work that suggests that this symbiotic association can be harnessed to achieve more economical use of costly superphosphate fertilizer and to permit better exploitation of cheaper, less soluble rock phosphate.

　　Mycorrhizal benefits are not limited to improved phosphate uptake in host plants.

　　In legumes, Mycorrhizal inoculation has increased nitrogen fixation beyond levels achieved by adding phosphate fertilizer alone.

　　Certain symbiotic associations also increase the host plant‘s resistance to harmful root fungi.

　　8. Which of the following most accurately describes the passage?

　　(A) A description of a replicable experiment

　　(B) A summary report of new findings

　　(C) A recommendation for abandoning a difficult area of research

　　(D) A refutation of an earlier hypothesis

　　(E) A confirmation of earlier research

　　For the following question, consider each of the choices separately and select all that apply

　　9. It can be inferred from the passage that which of the following has NOT been a factor influencing the extent to which research on mycorrhizal fungi has progressed?

　　□A Lack of a method for identifying mycorrhizal fungi

　　□B Difficulties surrounding laboratory production of specimens for study

　　□C Difficulties ensuing from the high cost and scarcity of superphosphate fertilizers

　　点击下一页查看答案：

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