Unsaturated water flow: (Multiple Choice)

Unsaturated water flow:
 
  A) is slower on sands than on clays if the soil moisture content is high.
  B) is stimulated by the osmotic potential.
  C) is driven primarily by the force of gravity.
  D) occurs on soils that are at field capacity.
  E) is faster than saturated flow.

Question 2

Of all the groups of soil organisms, bacteria have the most diverse metabolic capabilities.
 
  Indicate whether the statement is true or false

Question 3

Which of the following best characterizes the field capacity of a soil?
 
  A) water content of a soil with water potential of about -10 kPa
  B) a wetted soil prior to the removal of the gravitational water
  C) the total capillary water in a soil
  D) soil with water potential of -1500 kPa
  E) maximum capacity of a soil to hold water

Question 4

The osmotic potential would likely be lowest in soils of which of the following orders?
 
  A) Histosols B) Aridisols C) Ultisols D) Oxisols E) Spodosols

Question 5

Mycorrhizae involve a symbiotic combination of certain bacteria and plant cells.
 
  Indicate whether the statement is true or false

Question 6

Capillarity in soils:
 
  A) involves both adhesion and cohesion.
  B) does not account for unsaturated water movement in soils.
  C) is enhanced by the symmetrical nature of the water molecule.
  D) is independent of the matric potential in soils.
  E) is not involved in the process of water uptake from soils.