课程名称︰植物营养学 课程性质︰农化系必修 课程教师︰锺仁赐 开课学院：生农学院 开课系所︰农业化学系 考试日期（年月日）︰2015.4.23 考试时限（分钟）： 110分钟 试题 : Midterm examination of plant ntrition April 23, 2015 1. Explain the following terms: (20 points) (1) mineral element theory (2) secondary active transport (3) proton pump (4) phytosiderophores (5) apical dominance (6) uniporters (7) guttation (8) determinate plants (9) dource and sink (10)leaf area index 2. Name and briefly describe the two cellular pH-stat that contribute to the maintenace of a high pH level in cytosol of plants. Which one is dominant and why?(10points) 3. What is photorespiration? Discuss the meaning and significance of photorespiration of C3 plants.(10 points) 4. What are the mineral elements that take part in the light reaction of photosynthesis? (10 points) 5. Discuss: Why nitrate uptake of plant increases the pH of the outer solution and the reverse is true for ammonium uptake? (10 points) 6. What is the acid growth theory? (10 points) 7. How might the pH of the xylem sap regulate the uptake of absicic acid (ABA) in leaf mesophyll cells, thus helping the leaf to adapt to water stress? (10 points) 8. Discuss why and the significance of the resting membrane potential of root cells are often more negative than -100mV. (10 points) 9. Discuss: Why the foliar fertilization is important in agricultural production worldwide.(10 points) --

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