Use of synthetic fertilizers often leads to the contamination of groundwater with nitrates. Nitrate pollution is also a suspected cause of anoxic "dead zones" in the ocean. Which of the following might help reduce nitrate pollution?
A) growing improved crop plants that have nitrogen-fixing enzymes
B) adding nitrifying bacteria to the soil
C) adding denitrifying bacteria to the soil
D) using ammonia instead of nitrate as a fertilizer
A
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The process by which bacteria and fungi break down
nitrogenous materials forming NH4+ is a. nitrification. b. ammonification. c. denitrification. d. nitrogen fixation. e. respiration.
Which of the following intestinal protozoa are considered parasites of humans only?
A) Entamoeba histolytica B) Balantidium coli C) Cyclospora cayentanensis D) Giardia intestinalis E) both Entamoeba histolytica and Cyclospora cayentanensis
Zoogloea form flocculent masses in
A) anaerobic sludge digestion. B) primary sewage treatment. C) activated sludge digestion. D) tertiary sewage treatment. E) water treatment.
Which section of the small intestine is devoted to absorbing water and the products of digestion into the bloodstream?
A. ileum B. jejunum C. duodenum