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Microbes in Aquatic Environment

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
Coliforms are used as indicator organisms because

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

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Microbes in Aquatic Environment
Activated sludge undergoes

any of these
Tertiary treatment
Secondary treatment
Primary treatment

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

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

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Microbes in Aquatic Environment
Loss of carbon through the microbial loop in oligotrophic environments is __________ to/than the loss of carbon through the microbial loop in copiotrophic environments.

approximately equal
half
lesser
greater

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Microbes in Aquatic Environment
All of the following species are considered coliforms except

Salmonella typhi
Enterobacter aerogenes
Klebsiella pneumoniae
Escherichia coli

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