Which of the following statements about biogeochemical cycles is true
A) Not all living microbes require carbon.
B) Nitrogen fixing bacteria must be in association with legumes.
C) Thiobacillus oxidizes hydrogen sulfide to sulfuric acid.
D) Cyanobacteria are the primary symbiotic nitrogen fixer.
Correct Answer:
Verified
Q27: Phytoplankton include:
A)cyanobacterteria
B)diatoms
C)dinoflagellates
D)all of these choices
Q28: Which of the following is used to
Q29: Eutrophication leads to:
A)a decrease in oxygen
B)plants become
Q30: The primary producers in the ocean are:
A)bacteria
B)viruses
C)phytoplankton
D)two
Q31: Which is the order of purification procedures
Q33: Soil contains human pathogens,for instance _.
A)Clostridium tetani
B)Bacillus
Q34: How do the ONPG and MUG test
Q35: Which of the following statements about soil
Q36: The trickling filtration system employs a bed
Q37: Tertiary treatment of sewage could include:
A)chlorine
B)UV light
C)ozone
D)all
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