课程名称︰植物营养学 课程性质︰系必修 课程教师︰锺仁赐 开课学院：生农学院 开课系所︰农化系 考试日期（年月日）︰2011.6.23 考试时限（分钟）：120分钟 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : 1.Why do the insects or pathogens attack the nutrient deficient plants first rather than the nutrient sufficient ones? (10 points) 2.How do you know the site of nitrate reduction of plants─root or above ground parts? (10 points) 3.Describe the N assimilation procedures from nitrate to the first amino acid produced in plants, including the related enzyme and the organs or organelle where the reactions take place. (10 points) 4.Why do the dry weight of plant increase mostly in day and the height increase in night? (10 points) 5.In which organ is the sulfate mainly reduced? What form of sulfur can be cycled via phloem in order to cover root demand? What compound is the first stable product in which sulfur is present in a reduced organically bound form? (10 points) 6.Describe the main symptoms of following nutrient deficiency of plants: nitrogen, phosphorus, and potassium. (10 points) 7.The potassium concentration in the stems of plants is usually higher than that in roots or leaves, why? (10 points) 8.Describe root pressure, indicate when it might occur and how to know the existence of root pressure. (10 points) 9.Explain the following terms: (20 points) (1)system and product (2)secondary metabolites (3)pressure flow (4)apical dominance (5)calcicole and calcifuge (6)biological yield (7)leaf area index (8)lime induced chlorosis (9)the first and the second sink (10)phytosiderphore --

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