Which of the following groups of organisms are responsible for greatest amount of organic matter decomposition in soils?
A) microflora B) microfauna C) macrofauna D) autotrophs E) mesofauna
Question 2Fungal hyphae have an important influence on soil structure because they:
A) stabilize macro aggregates.
B) are active in the formation of soils crusts.
C) create large channels that enhance water flow and aeration.
D) help to flocculate the soil colloids.
E) all of the above
Question 3An organism that subsists by eating predators would function as a ________ in the soil ecosystem.
A) primary consumer
B) decomposer
C) tertiary consumer
D) detritivore
E) all of the above
Question 4The drainage class of a soil (the degree to which the soil becomes water-saturated during the year) can be judged by the presence and location of gley in the soil profile.
Indicate whether the statement is true or false
Question 5Vesicles and arbuscules are structures typically formed:
A) in bacterial cells when attacked by protozoa.
B) in root cells by fungi when they form mycorrhizae.
C) by mesofauna when they incorporate organic materials into the soil.
D) above ground by certain soil fungi.
E) none of the above
Question 6Tillage when the soil is too wet is likely to increase the soil bulk density.
Indicate whether the statement is true or false
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