2. 职称英语
  3. Mycorrhizal fungi infect more plants than do any other fungi and are necessa

Mycorrhizal fungi infect more plants than do any other fungi and are necessa

游客2025-04-23  13
问题     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. Whether this resistance results from exclusion of harmful fungi through competition for sites, from metabolic change involving antibiotic production, or from increased vigor is undetermined.  [br] Which of the following most accurately describes the passage?
选项 A、a description of a replicable experiment
B、a refutation of an earlier hypothesis
C、a summary report of new findings
D、a confirmation of earlier research
答案 A
解析
转载请注明原文地址:http://tihaiku.com/zcyy/4050641.html
相关试题推荐
随机试题
最新回复(0)