课程名称︰植物营养学 课程性质︰系定必修 课程教师︰锺仁赐教授 开课学院：生物资源暨农学院 开课系所︰农业化学系 考试日期（年月日）︰2010年06月24日 考试时限（分钟）：110 mins 是否需发放奖励金：YES!! （如未明确表示，则不予发放） 试题 : 1. Describe the differences between calcicole and calcifuge from the point of plant nutrition. What is the probable reason(s) for these differences? (10 points) 2. What are pholem mobile nutrients? Classify the following mineral nutrients of higher plants into high and low mobility: nitrogen, phosphorus, pota- ssium, calcium, magnesium, sulfur, manganese, iron, boron, and zinc. (5 points) 3. Discuss the syrategies of iron uptake of plants under iron deficient con- ditions. (5 points) 4. Describe root pressure, indicate when it might occur and how to know the existence of root pressure. (10 points) 5. Explain the concepts of source and sink in phloem transport. Leaves are said to be sinks early in development and to become sources as they attain photosynthetic competence. What experiments would you design to study the leaf transition from sink to source? (10 points) 6. Describe the pressure-flow model of translocation in the phloem. Does water move down its water potential gradient in this model? (10 points) 7. Describe the N assimilation procedures from nitrate to the first amino acid produced in plants, including the related enzyme and the organs or orga- nelle where the reactions take place. (10 points) 8. What is a mineral deficiency? How can a mineral deficiency be recognized? (10 points) 9. From the standpoint of soil properties and plant characteristics give the reasons for the relative bioavailability of heavy metals followed the se- quences: Cd > Zn > Ni > Cu > Cr > Pb. (10 points) 10.Discuss the following results (Table 1) of study as affected by silicon (Si). (10 points) Table 1. Effect of silicon on the rice plant in ferrous sulfate solution ——————————————————————————————————————— Part Dry weight SiO2 content Amount of H2O Amount of Fe Amount of Top Root Top Root uptake uptake Fe3+ solution (g/plant) (g/kg) (mL/plant) (μg/plant) (μg/L) ——————————————————————————————————————— +Si top 3.1 --- 18 --- 16 200 22.7 excised -Si top 3.2 --- 0 --- 21 197 19.3 excised +Si top 3.4 1.5 21 10 26 168 300 intact -Si top 3.4 1.5 0 0 29 217 25.7 intact ——————————————————————————————————————— 11.Explain the following terms: (20 points) (1) system and product (2) secondary metabolites (3) phloem loading (4) apical dominance (5) acid-growth theory (6) biological yield (7) leaf area index (8) lime induces chlorosis (9) guttation (10)Viets effect --

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