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Question: 1. At 50% of field capacity, the matric potential of clay soils
is:
A. less negative than loam an…


1. At 50% of field capacity, the matric potential of clay soils
is:

A. less negative than loam and sand

B. more negative than sand and less negative than loam

C. more negative than loam and sand

D. less negative than sand and more negative than loam

E. matric potential is equivalent for all soils at the same
water content

2. Factors that affect percentage base saturation of soil
include (choose any/all that apply):

A. clay content

B. parental material

C. total precipiation

D, soil water content

E. depth of O horizon

F. soil microbial respiration

G. soil pH

3.Which of the following statements about symbiotic nitrogen
fixation is true (select any/all that apply)?

A. It requires a symbiotic association between a plant and
either a prokaryote or fungus.

B. it is only found in the plant family Fabaceae

C. It can be an important source of N to soils and protein to
herbivores.

D. It occurs in specialized root structures of the host
plant.

E. it is found in all species of Fabaceae

F.. it is found throughout the plant kingdom

G. Symbiotic N-fixers require photosynthetic carbon from their
hosts

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