10. True/false questions. Put a âtrueâ or âfalseâ next to the statement. If true, explain
why. If the statement is false, explain why it is false.
(a) âBecause of the recent development of universal growth conditions, the majority of microorganisms are culturable.â
(b) âThe addition of high concentrations of charged chemicals (positive or negative) can decrease aggregate formation in soil.â
(c) âIn the addition of a genetically-engineered bacterium to a lake, the bacterium would represent an autochthonous population.â
(d) âThe behavior of microorganisms is difficult to predict because the environment acts as a closed system.â
(e) âMetal bioavailability is often increased during the secondary treatment in wastewater treatment.â
(f) âThe three phases in soil are sand, silt and clay.â
(g) âOnly aerobic metabolisms will exist in an aerobic environmental system.â