Midterm Exam of Plant Physiology (2004.3.18)--total scores of 110 1.Here are some calculation and assay questions concesning the water potential and water movement(40 points). (1)Your window plant wilted because you forget to water it for almost one week , and the solute potential of you plant is now equal to -0.712 Mpa. Your kind roommate remind you to rescue it, and after watering its water potential increase up to -0.238Mpa. What will happen to your plant in appearance?(2 points)What factor causes this phenomenon? (2 points)And, what are the changes of the factor in MPa unit?(5 points) (2)What is the driving force that moves water through soil?(2 points)It is expressed in positive or negative unit? (2 points)Please explain what are the differences between field capacity and permanent wilting point?(6 points) (3)There are two cells,A and B. Assuming that the pressure potential of both is 0.2MPa. The A cell has a sucrose concentration of 0.1M,and its solute poetntial is -0.244MPa. The sucrose concentration of B cell is 0.3M. What is the water potential differences between these two cells?(5 points) Where does the water will move to (A to B;or B to A)?and, why?(4 points) (4)How does plant maintain the integrity of wate column in vascular tissue? (6 points)And, how does it dissolve and/or prevent the problem of embolism? (6 points) 2.List three unique properties of water that make it such a good medium for cellular functioning, and explain how each property is useful to the plant (12 points). 3.Describe in your answer the following contents:(1)water potential differences,(2)type of transport,(3)the tissue, that water uptake and radial transport through a root.(16 points) 4.Describe root pressure and indicate when it might occur?(6 points) 5.Why is it difficult to supply iron in nutrient solutions?(4 points)What is the best way to overcome this difficulty?(4 points) 6.In practice, how do you determine a particular nutrient deficiency based on symptom? Please list your order of judgment, and explain why?(5 points) 7.What mechanism governing the absorption and uptake of mineral ions from soil particles into plant cells?Please use cation and anion as example to explain.(6 points) 8.The observed concentrations of calcium and chloride inside of pea root cell are 2 and 6 mM,respectively.These numbers are somehow different from those predicted from Nernst equation, which are 5360 and 0.0136mM, respectively. Please explain how does this phenomenon result from?(6 points) 9.What is the role mycorrhizae play to affect plant growth?(1 points)What are the two types of mycorrhizae?(2 points)How do they work?(6 points)What plants do they generally associate with?(2 points) --

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