课程名称︰植物营养学
课程性质︰农化系必修
课程教师︰钟仁赐
开课学院：生农学院
开课系所︰农化系
考试日期（年月日）︰2014.04.17
考试时限（分钟）：10:20~12:10, 110 min
是否需发放奖励金：是
试题 :
1.What are the criteria of essentiality of mineral nutrient proposed by Arnon
and Stout(1939) for higher plants? Name the all essential elements of higher
plants. Which are phloem immobile nutrients? (10 points)
2.Why calcium and boron are the intergral components of cell walls and plasma-
lemma? (10 points)
3.Discuss the meaning and significance of the term "primary active transporte-
rs", "secondary active transporters", and "passive transporters" in relation
to the process of plant nutrient uptake. (10 points)
4.Discuss why and the significance of the resting membrance potential of root
cells are often more negative than -100 mV. (10 points)
5.When nitrogen is supplied as NH4NO3, ammonium ion is taken up in preference
to nitrate ion. It can be said that ammonium supply inhibits nitrate uptake.
Set up a simple experiment without measuring the changes of nitrate or ammo-
nium concentration in the medium and prove it. (10 points)
6.What kinds of inorganic gases that can be absorbed and immobilized by plant
or released from plant? (10 points)
7.What is the importance of the foliar fertilization in agricultural producti-
on worldwide? (10 points)
8.How do changes in the pH of the xylem sap regulate the uptake of ABA in leaf
mesophyll cells? How would this help the leaf to survive under water stress
conditions? (10 points)
9.Describe the pressure-flow model of translocation in the phloem. Does water
move down its water potential gradient in this model? (10 points)
10.Explain the importance of remobilization of nutrients during the lifespan
of plant organs. (10 points)