Exam2_F08 - PLSC204 Exam #2 Fall 2008 This Exam has 50...

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PLSC204 Exam #2 Fall 2008 This Exam has 50 questions; each question is worth 2 Points (100pts possible) 1) In a soil where all of the iron has been reduced, you can be pretty sure that: (A) the soil is aerobic, (B) ferric iron is present, (C) nitrate has been reduced, (D) oxygen is present, (E) none of the above 2) The vadose zone will likely have a water potential: (A) between 20 and 50 kPa, (B) less than 0 kPa, (C) much lower than the water potential in the leaves of a transpiring tree, (D) of greater than 50 kPa, (E) none of the above 3) A water potential of -3,100 kPa is associated with: (A) the water table, (B) the permanent wilting point, (C) field capacity, (D) the hygroscopic coefficient 4) In nearly all mineral soils, we expect the mass water content to be ___________ the volumetric water content. (A) equal to, (B) less than, (C) greater than, (D) unrelated to 5) The relationship between water content and water potential in a soil is complicated by: (A) redox potential, (B) the water table, (C) political considerations, (D) hysteresis, E) none of the above 6) We use Darcy’s Law to calculate: (A) Eh, (B) pH, (C), Occam’s razor, (D) Ψ, (E) K sat 7) In the reaction below, what is the oxidizing agent?: (A) glucose, (B) water, (C) oxygen, (D) hydrogen C 6 H 12 O 6 + 6O 2 → 6CO 2 + 6H 2 O + Energy 8) You have filled a one-liter beaker with a soil having a bulk density of 1.325 grams/cm 3 . If the soil is completely dry, how much water will fit into that beaker? (A) ¼ liter (B) ½ liter, (C) ¾ liter, (D) 1 liter 9) Which of the following soil textures is likely to have the most water available for plants ? (A) sand, (B) clay, (C) sandy loam, (D) silt loam, (E) granite 10) An oxidizing agent: (A) can only function in anaerobic environments, (B) donates electrons, (C) will rarely be found in soils, (D) is always very small, (E) none of the above 11) Unsaturated water flow through soils is: (A) faster than saturated flow, (B) driven primarily by the force of gravity, (C) not influenced by soil texture, (D) largely independent of gravity, (E) all of the above 12) The general relationship between E h and pH is : (A) both are measures of hydrogen, (B) as pH goes up, E h goes down, (C) as pH goes up, E h
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Exam2_F08 - PLSC204 Exam #2 Fall 2008 This Exam has 50...

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