Biomass consists of:
A) living organisms and cells.
B) dead tissues and wastes.
C) identifiable biomolecules.
D) polymerized, non-identifiable molecules.
E) all of the above
Question 2Gypsum or nylon blocks are most useful in estimating the soil water content if the soil is quite dry.
Indicate whether the statement is true or false
Question 3For most soils, plowing and harrowing every year improves soil tilth in the long run.
Indicate whether the statement is true or false
Question 4To avoid a nitrate depression period when it is added to a garden soil, about how many kg of nitrogen must be added to a load of grass clippings that contains 1000 kg of C and 25 kg of N?
A) 100 B) 15 C) 75 D) 35 E) 50
Question 5Green plant residues such as grass clippings or a green manure crop generally have a water content of about ________ by weight.
A) 75 B) 10 C) 95 D) 45 E) 25
Question 6Plant roots are an important source of carbon for many soil organisms which are beneficial to plants.
Indicate whether the statement is true or false
Question 7The following are characteristics of a water molecule.
A) The H to O to H angle is approximately 90C.
B) It is held in soils by adhesion but not adsorption.
C) The two H atoms are on diametrically opposite ends of the molecule.
D) It has a positive and a negative side.
E) It is attracted to surfaces with negative but not positive charges.
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