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Microbes in Aquatic Environment

Microbes in Aquatic Environment
The amount of oxygen dissolved in hypolimnion water in the winter is __________ to/than the amount of oxygen dissolved in hypolimnion water in the summer

half
lesser
greater
approximately equal to

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Microbes in Aquatic Environment
Trickling filter comes under

tertiary treatment
secondary treatment
none of these
primary treatment

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Microbes in Aquatic Environment
Metabolism of dissolved organic material released by phytoplankton allows heterotrophic bacteria to become part of the particulate organic matter that is passed up the food web to be metabolized and released as mineral elements and CO2 at each transfer. This sentence describes the

Gibbs free energy
Redfield ratio
microbial loop
Winogradsky column

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Microbes in Aquatic Environment
Which of the following species in water reveal the presence of fecal pollution of human or animal origin?

All of these
Clostridium perfringens
E.coli
Fecal Streptococci

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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, phosphorous and sulfur
carbon, hydrogen and oxygen

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

Escherichia coli
Klebsiella pneumoniae
Salmonella typhi
Enterobacter aerogenes

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