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Microbes in Aquatic Environment

Microbes in Aquatic Environment
The rate of flux of oxygen in air is __________ to/than the rate of flux of oxygen in water.

approximately equal
greater
lesser
half

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Microbes in Aquatic Environment
Coliforms are used as indicator organisms because

they are present wherever enteric pathogens are present
a testing procedure with great specificity is easy to perform
both (a) and (b)
None of these

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Microbes in Aquatic Environment
The Redfield ratio is an index of concentration of

carbon, nitrogen and phosphorous
nitrogen, potassium and iron
carbon, hydrogen and oxygen
carbon, phosphorous and sulfur

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Microbes in Aquatic Environment
Members of all of the following genera of bacteria typically are found in a maturing Winogradsky column except

Chlorobium
Rhodospirillum
Escherichia
Clostridium

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Microbes in Aquatic Environment
Chemical precipitation of phosphorus is

secondary treatment
primary treatment
both (a) and (b)
tertiary treatment

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Microbes in Aquatic Environment
Activated sludge undergoes

Secondary treatment
Primary treatment
any of these
Tertiary treatment

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