Maintaining soil reaction at pH 7.0 is likely to virtually eliminate any significant ________ by heavy metals applied to soils with sewage sludge.
A) plant uptake B) leaching C) adsorption D) precipitation E) A and B
Question 2Which of the following pH values represents a neutral condition?
A) 10 B) 10.0 C) 7.0 D) 1.0 E) 6.0
Question 3In the United States between the 1970s and the 1990s, the level of heavy metals found in municipal sewage sludge ________.
A) increased substantially B) decreased substantially C) stayed about the same
Question 4Which of the following are considered to be heavy metals that can contaminate soils and the food chain?
A) cadmium
B) lead
C) zinc
D) copper
E) all of the above
Question 5Bioremediation of contaminated soil involves the use of ________ to ameliorate the soil pollution
A) binding chemicals
B) soil microorganisms
C) organic solvents
D) photo-decomposition
E) incineration
Question 6It has been found that continued, repeated application of an organic toxin to a particular soil will ________ the capacity of that soil's microflora to degrade the compound in question.
A) gradually inhibit B) gradually enhance C) have no effect on
Question 7The amount of a pesticide that hits the target pest is usually ________ of the amount applied to the ecosystem.
A) 25 to 50 B) 75 to 95 C) less than 5 D) 50 to 75 E) 20 to 25
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